Floor pans generally go in from the top and overlay the rear frames and rockers. I don't know how you could do it from the bottom without a lot of extra cutting. Cross bracing the door jambs (both directions) is a good start. Are you keeping the trunk pan in, or doing a full floor-trunk pan in one piece? If everything I would think a LOT more bracing would be in store, especially if you plan to rotate. you won't have a flat plane (garage floor) to measure from.
I used to be indecisive. Now I'm not sure. I feel like I am diagonally parked in a parallel universe. 1968 400 convertible (Scarlet) 1976 T/A - 455 LE (No Burt) 1976 T/A New baby, starting full restoration. 1968 350 - 4 speed 'vert - 400 clone (the Beast!) 1968 350 convertible - Wife's car now- 400 clone (Aleutian Blue) (Blue Angel) 2008 Durango - DD 2008 GXP - New one from NH is AWESOME! 2017 Durango Citadel - Modern is nice! HEMI is amazing! 1998 Silverado Z71 - Father-daughter project 1968 400 coupe - R/A clone (Blue Pearl) (sold) 1967 326 convertible - Sold 1980 T/A SE Bandit - Sold
