So far as the current red-drawn design for the gun arm, I\'m thinking that a simple Orky solution for stability would be to make it similar to what\'s in the original sketch - use a strip of balsa wood or something similar as the backing for the barrels (the side facing towards the viewer in the sketch) and then have the barrels fastened on (like in the sketch) with riveted/welded metal banding holding the barrels in place from the front to the solid support of the solid wood/metal inner arm beam.
Diameter-wise, it looks like you could probably use something like the tube of a Bic ballpoint pen for the upper kannon tube and drill pin vise holes for sloppy venting. I\'d say the lower gun (if I were an Ork) ought to be a machine gun/shoota for volume of fire - best of both worlds! Massive damage and an accompanying big *boom* as well as rows of Marines mowed down by chained fire, all by one arm! To that end, I\'d say the stuff you can\'t see from the concept sketch that\'s hidden behind the body ought to be a drop-in clip type feed for the kannon ammo (I really love the large-scale shells you\'ve done thus far and you may as well have a banana clip or something showing off 4 or 5 feeding in from the top!) As for the lower rapid-fire shoota, maybe a couple round drums in sequence a la a big ol\' Tommy gun with two ammo feeds, one high and one low next to each other, with a slotted hole spitting out spent rounds. So far as the choppa goes, I\'d say model it on one of the old Epic scale Gargants - a thick wedge-style toothed chainsaw/rippa with rilly big shark-like teeth. I think the one in your most recent red design sketch is kinda \"skimpy,\" IMO, and the blade really ought to start lower and stick out farther so that when it \"drops the hammer\" on some hapless Dreadnought, neither the front end of the gun barrels or the underside of the arm with the magazines, cables, and other important bitz get caught on what the arm has been dropped onto. I\'m also thinking about what you said of the weight of the arm, and IMO really all you need are pulleys or chains/belts on only the upper surface of the arm because the easiest method of lowering it (the Orky way!) would be to let the weight of the big-ass arm drop itself with effort only put into pulling it back upwards again. My thinking from the sketches and your work so far is that the gun/rippa arm does 3 things: it holds level to fire, the shoulder swivels the whole guns \'n\' rippa works side-to-side, and the whole thing can get cranked up above shoulder level so that its own weight allows it to be dropped so\'s it can bludgeon and chew into whatever happens to be underneath.
I\'m really loving the work thus far, and it ought to look excellent with rusty bolted pieces all over the body mixed with squares of different colors from all the scavenged Rhinos and such that the Orks took scrap from to make it. I\'d say paint the head primarily red, because that\'s the part that makes the whole thing go fasta! (Red interior lighting a la a submarine is how I view the interior of the \"mouth\" cabin, and are you sure you wouldn\'t consider yellow lighting for the eyes? I don\'t think green eyes are nearly demonic enough for a toothy grinning Orky skull face dripping with red paint.)
No critiques here; just suggestions... the whole thing thus far is just great, and I can\'t wait to see more progress!