Not sure if this has been done before(it probably has), but here is how to make a decently protected sniper that fires 4 SC200's well(still working on fire order and barrel rotation).
You have(at least) two options here, either inverse legs(MSK-AJ401), or treads(M07CL Hooker). I am sure more legs work, but those are the legs I would use until I develop this hound more. Anyway, start out by placing a G-Shajar gen on top of the legs, rotate it so that the short end(end with small circular vent) is facing forward. From there, place the M06SP Arm spacer, or isba(your choice), off of the the peg towards the back of the hound(single peg on gen, three peg part rotated up into the air). On top of that, the only small :):):):) pit I could get to fit was the MSK-C10(experiment if ya want). I use the MSK-AM120 armour pieces on both sides of the arm spacer so it covers a good deal of the Pit, two on the side of the gen, and one in front(all laying horizontal). Atop the gen I used four MSK-SC200's. I haven't yet found the best firing order/rotation but my current set up has 1 SC200 on top of the gen aimed up, one above that pointing down. It is the diamond looking set up, for the other two Sc200's, I have both rotated inwards, one rotated in and up, the other in and down. Experiment with firing order/rotation as you see fit. on the back of the pit I put the radiator RD-Buhayra for some cooling.
Effect Time: 8
Max Speed(on Treads): 158