Movecraft is a plugin that adds huge planes and ships to the server. I love this plugin especially since I build HUGE planes and bomb people with them or transport materials or just about anything.
Crackshot is a plugin that adds guns to the server. It goes perfect with movecraft.
I don't think the server could handle it, using all those resources, when it could be better spent on making the map bigger or something.
You could donate monthly to give the server more RAM though.