If I had my choice it would be metal. These kits could easily be tig welded to get rid of most the rivet joints and the welds would make a great detail in the finished tank. Looks like with the proper esc's for brushed motors these kits could be run off the new tank control boards. All the rest of the functions could be done with servos and with up to 16 channels lots of things could be automated from guns to hatches to drivers.
Jimmy