Interesting that you feel the seats in the C4 are uncomfortable, while some guys here replace C5 seats with those from the C4 because of the comfort.
My wife loves the seats in my C4 but I don't believe she has ever been in a C5 or C6 (its possible my Corvette is the only one she has ever sat in). And I've never spent enough time in a newer one to really know those seats like I do the ones in my C4.
Because my wife likes them so well I may use a set of C4 seats in the truck I'm building for her.
I agree that how common and how easy to replace are factors in cutting things up. Part of easy to replace is the financial value represented by the thing. While C4s are still loosing value my C4 driver is still worth too much to part out. If I wanted to use C4 suspension or other parts in a project I'd look for a $1,000 car instead of taking one apart that I have $12,000 into. I know they are out there and since I have too much into mine I'll keep driving it to get the value out of it.
There has been talk in the State of Washington where I live of taxing vehicles based on motor size. The state senator behind that proposal lives just around the corner from me. So far he hasn't gotten much support, but with five motors over 450 cubic inches I don't think of a 350 as big and I'm not a fan of that approach to filling the state treasury.
