I have an idea: What if we contacted Brickarms and asked if we could use the stuff they make in the game? We would give them credit of course. Mainly the Sci-Fi Weaponry, though.
For those of you who don't know what Brickarms is, click here: http://www.brickarms.com/
Sci-Fi weapons are here: http://www.brickarms.com/toys/SciFiWeaponry.aspx
I was thinking of specificaly using the Needle gun, Energy Pistol, Chainblade, Photon Pistol, and Retro Blaster found here: http://www.brickarms.com/toys/SciFiWeaponry.aspx