This is a small, quick sketch I did. Sloppy, but I liked the design, so I colored it and tossed it up here. I see it as some kind of construction mech which was modified to meet baseline combat capabilities.
I added this to my favorites a while ago, but I've recently been hunting around for non-military mecha and battlefield expedient mecha/technicals for a short while now (as inspiration for a Mekton-Z game that I'm running, as it happens), and I'm dismayed at how little there seems to be. Excellent work and not too hard to see what it probably looked like unmodified.
Thanks very much! You're an observant fellow -- I was indeed thinking Kondo/Kobayashi on the gun. The main unit was most inspired by some of the old, obscure prototype ATs depicted in Dual Magazine. You can see them here: [link]