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What is the level of integration of the FCS and radars etc needed for SeaWolf to the rest of a ships computing systems? Can SeaWolf just simply be plug-and-played by bolting a few VLS tubes to the deck and connecting a few wires or are there fundamental compatibility issues which require designing any Sloop around the weapons system?

Same question for Aster in Sylver tubes... do they require a S1850 radar and the SAMPSON radar suite or can it be fed from some bog-standard radar?

If SeaWolf or even Aster can be placed upon a ship, without expensive radar and associated systems, then this may well be cost-effective. I thought that this was not the case however...


Cheers

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[NB: all my comments are derived from public domain information, somebody in the know could probably give a much better answer.]
There isn't really a short answer to this.
SeaWolf is a command line of sight, which means that it relies on commands being fed into it from the ship which tracks the target with on-board trackers. Hence a SeaWolf ship requires the substantial Type 910/911 trackers to guide the missile, and a search radar to cue it up. Similarly, the ship requires a CMS that can manage all of this. So, to a certain extent, yes a SeaWolf ship does need to be designed around the SeaWolf system (although the SeaWolf Leanders proved that you can retrofit it, albeit with difficulty and at great expense).
Aster, however, is a different kettle of fish. It's fully active with mid-course guidance. In essence all the ship does is point the missile in the direction of the target, and then rely on the missiles radar to find the target and guide itself into a kill position. So, theoretically, you could cue the missile with the most basic radar you want provided that you also have the a data-link to communicate with the missile. Of course, to get full use of the Aster 30 you need a big search radar to get a general impression of what's going on a long way away (e.g. S1850), a very high definition search radar for closer in so you can distinguish between targets accurately and give the Aster the best information possible in order to give it the best chance of hitting the target you want it to (e.g. SAMPSON), and a CMS able to keep track of all of this. But you don't actually need all of that to fire Aster.
So for a sloop which isn't expecting to be saturated from multiple angles by supersonic ASM, there is no reason that Aster can't be cued by a fairly basic air search radar able to guide it to the general vicinity of the bogey and then rely on the missile to do the rest. So in that sense, no, the ship does not need to be designed around the weapons system.

One important point: SeaWolf was designed in the '70s and it required a hell of a lot of computing power by the standards of the day. Aster was designed in the '90s (first live test 1997), and required quiet a bit of computing power by the standards of the day. But this is 2007, which means (consistent with Moore's Law) that we have computer available now with roughly 64 times the power available in 1997. So providing enough computer power for the CMS to run these missiles isn't really a problem, and should be possible with ruggadised COTS components.

Hope all of that helps/doesn't make you more confused.