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Does anyone know how to make terminator assault cannons, CML, and dreadnought TLAC from cheap materials?

plasticard rods/straws! Build an plasticard box, with a strip cut out, fill it with tiny rods glued from the inside to look like ammunition. Then create a suitable middle portion that looks like the firing chamber (refer to bolter, autocannon, or other favorite weapon), and then take a longer rod of plasticard and attach it to the end. Take a straw that slides overtop of the rod and fits snugly, give it some vertical slashes with a file or knife or saw to look like the muzzle break, and you're done.

Assault cannon, same thing. Make a box for ammo, then a firing mechanism. Now just take 6 rods of plasticard, glue a them together, and create the supporting bar from underneath, and another plasticard straw of the same diameter to mekt the barrell tip.

I found it easier to use SEVEN rods for an assault cannon.

Start with three side by side, then glue two more on top, into the valleys. When they are dry, turn it over and do the same to the other side. Six barrels around a central spindle.

You might even be able to make the stems from cotton buds work, but Chromedog has mentioned the best construction process.