'65 Barracuda Interior moldings under rear window
I believe that Barracuda trunks were painted body color, just like all other A body Mopars in 65. That includes the floor and the inside of the quarter panels. My original white 65 Barracuda had a white painted trunk. My gold 66 Barracuda had a gold painted trunk. The plastic latch cover in my 65 was black; the cover on my 66 was gold (not sure if it was gold to match the exterior or interior, but I think to match the interior since that is what my 65's cover matched). The trunk side of the fold-down panel was black on both. The 65's trunk carpet was black, the 66's trunk carpet was gold. Since my 65 is red now, the trunk should also be painted red, but I just painted it black to match the carpet since the car is a long way from original anyway. Here's a picture of the trunk floor of the 66 (which I no longer have). The sides have gold overspray on them, but the floor is original paint.