Yes it is possible and we have done it before on some SEA terrains. However, it depends on what you mean as skinnable. If you mean can you say put down a P47D11 as a static ground object (park on a tarmac) and then have a way to change its skin from one to another available skins for it when you load up the terrain I don't believe so. But would have to double check. If you want to just put planes and tanks down you can place them as objects. Or you can always build a new custom object and insert into the terrain. That is how Hawaii had the actualy Arizona battleship on battleship row. I think we might also have had a PBY or two on Ford Island.