Almost finished the 3D model in Sketch-Up (pictured above), only two extra attachments left to model, (the turbo booster). Have been watching episodes of Bravestarr for reference and estimate this riffle, made full scale, would end up being six foot long - as high as Marshal Bravestarr himself...
Truly an insane paper prop! - Might have to buy myself and A2 printer for this one, he,he,he :-)