AGAIN vode??? Your armor looks great, but I like this one the best yet. Are you going to add the B.F.G* to your concept, you know the one in your avatar???
which bfg, the one in your avatar or the one in ANH???
If you have any detailed pics of it, you could cut the main assembly out of layers of wood, along with detail parts and then use PVC (or ABS which is cheaper in shorter lengths.) to build the barrel.