Finally started the adult-sized G1 Prime-rifle a few days ago, W.I.P. has be-gun! This will be about 3ft long, and will be a composite of general-features derived from the G1, MP & cartoon-guns, done in my own way. You should be able to hold it comfortably with one or two hands, as I plan on adjusting the weight & making it well-balanced when it's done. Made from substrates ranging from PVC, ABS, couplings, styrene, aluminum, nuts, bolts and EVA-foam. Will also likely build a small prop to help the rifle display nicely & horizontally on a shelf. Not sure if lighting will be done in the end of the barrel, but it's certainly being considered.