Hi, Kristof, thanks a lot for your support on ideas!. I checked the skeleton's legs, they works great and looks better that the original.
Yes, the top disk is a little too angular, but I could not find a better way to do it yet. I think your idea for the docking rings is very good, the hexagon shape plates looks better than the round plate. About the minifig trophies, I really like they size and details.