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What I'd do, honestly, is to buy a basilisk and then just cut the barrel way short. That and figure out some way to get a crane mechanism on the back - raiding the dollar store for toys might well yield good results.

The WW2 German Morser Karl train artillery makes a good piece for the colossus..here is mine....





Next step is to paint it...

Or you can do this...

Sure, you've got the expense of the enclosed Bassie but I'd imagine it wouldn't be too hard to replicate with plasti-card.

It's technically a Medusa I guess, but most people wouldn't know any different if you used Maxmini's Siege Gun for a Colossus model


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Actually the railway mortar looks good too if you can come across one of those model kits cheaply