I saw a gorgeous one painted bright yellow at the Rockingham show on the 6th. You have to be really careful with the floorpans on convertibles, it is all that holds the car together....
have you ever looked at the rockers on a convertible? those thing make the hard tops look wimpy. plus the convertible (at least mine did)have front and rear torque boxes even with a /6 installed
here's a cut away view of the 1/2 of a 64 valiant convertible I got from Waggin for parts to fix mine. plus after I got the floor pans welded in I added the sub frame connectors. I made the mistake of having the front wheels off the ground and when I tried to put the doors on the alignment was off a little I noticed it but most wouldn't have bothered with it, easy fix, but it shows how jacking it up changed the door alignment.
I braced my doors and windshield pillar post when I started cutting and pasting the floor pan back together but I had minimal flex with the floor pan out. I was ":glasses7:floored" seeing how well the convertible stayed straight with no floor pans from the firewall to the tail light trunk panel. nope, none,no floor at all. the hardest time I had WAS trying to deform it to get the rear right outer tail light mounting piece undrilled and put into alignment with the trunk panel. all the 66 darts I've seen have had the right outer tail lamp stick out the tiniest bit and I wanted to fix that, Dang that was harder than I expected trying to move it in 1/8 of an inch. 84 spotwelds and a 3 inch snatch strap let me move it into position. (I won't do that on the wife car) it's too much trouble for 1/8 an inch.