Hi Chris
I have done about 10 .. 911 / 930 rebuilds so i can tell you first hand ..
the cheapest you can possibly get a 911 painted for is about
3,000, and thats doing the stripping and dis assemby yourself
lots of hrs !!! ,then you would want to buy all new seals
and install windows ect ... so say 4k by the time your done
so ...
cheap roller 3,000
new paint and seals ect 4000 ( plus your hrs in labor)
so your into the car with a nice paint job for 7000
now im sure that 3000 roller didnt have a mint interior
so add seats,carpet door panels headlighner dash pad
, and then a set of wheels and tires $$
So my feeling is get a mint car , and strip the pig !
UNLESS .. you are building something you cant find like a rs clone

or a 934 or modified turbo body ..then its better to build one from a good shell
Joe