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Well, the larger calibre 750mm torpedo tubes vice 650mm provide either swimout launch or the ability to handle the large ASW missile, Yakhont ASUW/land attack cruise missiles, antiaircraft missiles in multiple launchers and the very long range torpedo. I would give the vertical launch tubes a dual purpose antiship/land attack role. As to the submarines size, that is hard to figure for me. I envisioned the sub to have SSI classification due to it's use of Stirling cylce AIP propulsion for long endurance at slow speeds without schnolkeling and burning liquid oxygen/diesel fuel vice fuel cells. It would be great if the propulsion diesel generators could run on a closed cycle burning oil and drawing liquid oxygen as investigated by the Kreigsmarine in WW2.

Roles and missions along with the size of the boat are undetermined. What I wanted was the capability to saturate an opponents defenses with near simultanous torpedo and missile attacks and having a land attack capability. A rescue chamber for evacuating the crew in emergencies as I don't think the customers would have a submerged rescue capability. The batteries would be higher energy density NiCad cells compared to lead acid.

All designs, I have learned involve tradeoffs between battery weight, AIP weight, pressure hull crush depth, main powerplant and armaments.
In this, I remember the Isralie Navy has four 750mm and six 533mm tubes for swimout launching and other purposes perhaps.

I guess I'm looking at a large single level torpedo room in the bow and a VLS aft the cell with the rescue chamber aft with a high degree of automation so the crew does not bunk in the torpedo room. A three deck level would be fine and a single hull at thiry feet diameter and 240 foot length or perhaps a four level layout makes more sense.
Torpedo room would accomodate four 650-680mm weapons and four 533mm weapons slots ready to fire and lauched via liners. An autonomous UAM missile could be fired from the tubes that homes by active radar/IR to kill ASW helos and hopefully maritime patrol aircraft.

Besides the usual decoys the 324mm Paket antitorpedo torpedo would be carried, all of which drive size and cost up but I don't know how much except to lengthen the hull out to 270 feet to accomodate systems. There would be three weapons serving each tube in a four across and two skids holding twelve 533mm and ten 650mm weapons. A possible loadout might be twelve 533mm and ten 650mm reload weapons that works out to thirty weaponswith twelve or sixteen VLS for cruise missiles.

As for the roles and missions I am uncertain and the design was inspired by the Amur 950 which has four/six(?) bow 533mm tubes and eight VLS for Yakhont with the intent of saturating an opponets air defenses.

An intesting development in Germany looks for a mast mounted autocannon of 27mm that can be raised and fired with the submarine at periscope depth on a mast that also supports presumably expendable UAVs.

It seems I have made a big error or rather a compilation of errors. The moderator can close this out. I'm not posting here further. I do regret this outcome.