I mentioned my driveshaft/floor spacial conflict. Well here's photographic evidence... You can see how close it is to that floor brace/seat support (this is with the rearend sitting where it would with no notch; frame on axle-tube):
...and at the trailing arm crossmember. Both the xmember and floor support just behind it will have to be clearanced:
So here's what the floor looked like:
...and now there's a 5" wide rift...
Looking forward; yep, gonna need more room here...