Bigger skins shouldn't be a problem for a hardware (especially graphic cards) newer than some 7 years. It is just matter of memory, and one texture takes only one place in memory (for maps 1Mb for one texture) and then just repeats.
Problem could be IL2's engine. Carsmaster made it for bigger textures, but how graphic engine will render it. Also, it is not so nice on old blocky looking planes (too low polygon count), we need planes with more polygons. I would say that this, at the moment, is more suitable for the ground, trees, vehicles, ships, than for the planes.