what am I missing? It looks to me like the inner wheel wells are intact and he needs the edges of the trunk floor and the inner fender extensions. Those parts are available. I've been told that the best fitting parts come from CASCO. they bought the dies from a person who used to sell the parts out of Long Island. If the problem is his floor those sections are also available. Just remember the 55 floor is different than a 56 and a 57. (The fuel float opening is in a different spot from 55 to 56.)
Me personally, I found a rear clip and will be salvaging what I need from that rear half of the Thunderbird.
1955 Thunderbird project in process
Tee-bird registry # 63034
CTCI member #37081