Great idea for cars like the Buick Grand National, Later modelled Chevy Impalla SS (The ones shaped like the caprice).
and classic cars.
The SVX? Like what was said earlier...it will be hard for some people to buy it for the amount of $$ and time put into it. I don't think it will be worth it.
Now rebuilding the trannys at a competitive price could be ok. I really can't think of anything else. You never know though. Ideas like this can get shot down by many until someone follows through with it and makes a fortune.