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For half as much, and goes twice as far... I think this is more like what I'd build.
She's short, stubby and not pretty, but she fits the 'Flower' role.
Fore 3" mount has lots of convenient places to hook off to, in order not to go overboard.
Aft 3" gun is on elevated platform, DC racks drop off stern on either side of it.
16 Type D Mark III depth charges (WWI relics, 500 lbs) on deck (8 per rack), carries 24 reloads.
AA mounts are on either side at the break; twin .303's where convenient.


HMS Lily, United Kingdom Corvette laid down 1940

Displacement:
472 t light; 500 t standard; 642 t normal; 755 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(195.00 ft / 185.00 ft) x 25.00 ft x (11.00 / 12.35 ft)
(59.43 m / 56.39 m) x 7.62 m x (3.35 / 3.77 m)

Armament:
2 - 3.00" / 76.2 mm 40.0 cal guns - 12.94lbs / 5.87kg shells, 500 per gun
Quick firing guns in deck mounts, 1940 Model
2 x Single mounts on centreline ends, evenly spread
1 raised mount - superfiring
8 - 1.57" / 40.0 mm 39.0 cal guns - 1.86lbs / 0.84kg shells, 1,000 per gun
Anti-air guns in deck mounts, 1940 Model
2 x Single mounts on sides, forward deck aft
2 raised mounts
8 - 0.30" / 7.7 mm 45.0 cal guns - 0.01lbs / 0.01kg shells, 2,500 per gun
Machine guns in deck mounts, 1940 Model
4 x Single mounts on side ends, evenly spread
Weight of broadside 41 lbs / 19 kg

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.00" / 25 mm 185.00 ft / 56.39 m 12.00 ft / 3.66 m
Ends: Unarmoured
Main Belt covers 154 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.00" / 25 mm - -
2nd: 0.50" / 13 mm - -

- Box over machinery & magazines: 1.00" / 25 mm

- Conning towers: Forward 1.00" / 25 mm, Aft 0.00" / 0 mm

Machinery:
Diesel Internal combustion motors,
Direct drive, 2 shafts, 3,000 shp / 2,238 Kw = 18.85 kts
Range 6,400nm at 14.28 kts
Bunker at max displacement = 255 tons

Complement:
63 - 82

Cost:
£0.179 million / $0.715 million

Distribution of weights at normal displacement:
Armament: 8 tons, 1.2 %
Armour: 136 tons, 21.2 %
- Belts: 82 tons, 12.8 %
- Armament: 5 tons, 0.8 %
- Armour Deck: 47 tons, 7.4 %
- Conning Tower: 2 tons, 0.2 %
Machinery: 80 tons, 12.5 %
Hull, fittings & equipment: 231 tons, 36.0 %
Fuel, ammunition & stores: 170 tons, 26.5 %
Miscellaneous weights: 16 tons, 2.5 %
- Hull below water: 12 tons
- Hull above water: 4 tons

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,857 lbs / 842 Kg = 137.6 x 3.0 " / 76 mm shells or 1.2 torpedoes
Stability (Unstable if below 1.00): 1.30
Metacentric height 1.0 ft / 0.3 m
Roll period: 10.5 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.12
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has rise forward of midbreak,
a normal bow and a round stern
Block coefficient (normal/deep): 0.442 / 0.463
Length to Beam Ratio: 7.40 : 1
'Natural speed' for length: 13.60 kts
Power going to wave formation at top speed: 60 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 11.30 degrees
Stern overhang: 6.00 ft / 1.83 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 20.00 ft / 6.10 m, 16.00 ft / 4.88 m
- Forward deck: 30.00 %, 16.00 ft / 4.88 m, 16.00 ft / 4.88 m
- Aft deck: 35.00 %, 8.00 ft / 2.44 m, 8.00 ft / 2.44 m
- Quarter deck: 15.00 %, 8.00 ft / 2.44 m, 10.00 ft / 3.05 m
- Average freeboard: 12.47 ft / 3.80 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 49.8 %
- Above water (accommodation/working, high = better): 103.6 %
Waterplane Area: 2,930 Square feet or 272 Square metres
Displacement factor (Displacement / loading): 193 %
Structure weight / hull surface area: 35 lbs/sq ft or 169 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.80
- Longitudinal: 8.03
- Overall: 1.01
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

xtvpry wrote:

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I think you need the best sea keeping possible. You need a decent deck gun for engaging U Boats on the surface. In this regard, I don't think that a 3" gun is enough. No, I would prefer a destroyer sized gun. Some consideration should also be given to the engagement of E Boats. You want to have as much flak as possible. Possibly a bulbous bow and strengthened keel for ramming. Plenty of misc. weight below deck for a small hospital and supplies for survivors.

Well, the bulbous bow (as SS knows it) wasn't in use on most of the escorts. They pretty much had normal straight bows with a bit of a shear to them. Perhaps some reenforcement would be needed, but that wouldn't really be the case as many escorts rammed U-boats, and virtually all (except maybe Dreadnought) sustained some degree of damage but still survived, I wouldn't think it was that important. Heck, many merchants have rammed other ships and sailed on without too much damage- and a U-boat wasn't all that massive or tough, hence why ramming worked.

Now, I wouldn't recommend it in MY ship; no amount of strengthening will help you when you hit something your own size at 40 KPH.

As for the 3" gun issue:
The guns on this ship aren't for killing a surfaced U-boat. They are for forcing a surfaced U-boat to submerge. The submerged U-boat could then be located on ASDIC and attacked in a FAR safer manner for the escorts. A U-boat can't ignore a 3" gun, even if it won't exactly kill it with one shot. To get away from an escort with an 18 knot top seed and much better seakeeping, the U-boat has only two options:
Kill the enemy
Dive and hide.