That Performa 200 looks to be in great shape. It is a little bit of a rarity.

As for the water that was sloshing around inside, unless the machine was turned on wet (which is highly unlikely, under the circumstances in which you found it), about the only things that could have been destroyed are the drives and the speaker unless rust had set in. If only dirty, it should clean up once disassembled with more water from the tap, and if left to dry, well, you never know your luck: a working Performa 200 hopefully awaits.

Otherwise, I think that if I only had the good plastics, I would rebuild from a scrap Classic/ Classic II.