Another one of my home made Empire artillery pieces, a Hellblaster Volley gun. All that was needed was some copper tubing, some Milliput and some balsa wood. The copper tube was cut into nine equal pieces. The pieces were glued to a balsa triangle and Milliput was wrapped around the end and the middle to hold the pipes together.
A box was constructed for the breach [I think that's the correct term] and a Milliput cog was made. Although not in this picture this had a sprue crosspiece from between four slotta bases as a handle and a skull was positioned in the centre.
One of the plans for this was that GW ran some rules in White Dwarf to mount a Hellblaster Volley Gun on the back of a wagon and with my success creating the Empire War Wagon I thought I'd have a go at that, though ultimately never got round to it. If I ever find the rules to it I'll pop them online.