I like Fuji colour, got some S2 Pro questions

S2 Pro is very cheap in the 2nd market. I have a few questions:
1) Does the 12 MP mode really output 12MP or is it less
2) In 12MP mode are the results sharp and detailed or do the pics suffer from
any degradation due to the interpolation. I want to make large prints.
3) Are green casts & CCD death very common
4) The body is plastic, but does it feel cheap and flimsy
5) Is the pop-up flash a relatively bad performer

Thanks