KR>KR2 or S Can you strech one?

[Russ & Brenda]

I'm new and I'm 6-2 and 250lbs. There is a KR2 I'm looking at to put a
corvair motor on, could I stretch the completed KR2 (Unpainted) or is that
more work than it's worth? I the KR2 big enough for me? I hope I'm not
asking dumb questions.
Thanks, Russ Houck.
Corsicana Texas.