Yes, you can do a 1024 res skin on anything in the game. In fact the old skins often have a better resolution than the newer ones. They often use two or in the case of the A-20s three 1024 res tiles instead of one. That doubles or triples the effective res right there. Then there is the mirroring that the old skins often incorporate. Mirroring is a pain for skinners. However it does mean that if a skin uses the same panel for the left and right top wing surfaces, then that doubled up surface can be twice the size on the tile. Therefore you get double the resolution on the skin.