The inner frame is the “ass-end of Barbataurus” i.e. the parts that form the “centaur” part of that kit. When I started working on this I was under the impression that Barbataurus contained enough leftover Barbatos parts to make a second mobile suit, minus the head and hands, but it turns out it only had the parts to make a second inner frame. Crucially, it was missing two of the three parts that make the chest, so I had to cobble those together myself.

The bottom part of the chest (everything below the vents) is the leftover Barbatos piece included with the kit, just repainted. For the vents I used some extra parts that were left on the sprues of my HGCE Dagger L (I think they were meant to be thrusters on the Windham) and for the top I took the early-type chest from my HG Origin RX-78-02 (I’d used the mid-type chest when I actually built that kit) and hacked away everything but the top panel. I painted the pieces up and glued them to the Barbataurus inner frame.

The shoulders were also leftover Barbatos pieces, so they just needed painting. The arms were another area where the Barbataurus didn’t have enough extra parts to assemble another suit (it had one extra arm-covering, not two) so I used the 30 Minutes Sisters Mechanical Unit option set instead. I figured I might as well use the legs from that set, too, since I wanted the suit to have an extra set of thrusters for when the G.O.O.S.E. was deployed. I ran into trouble with the arms, though, since the peg-hole that they connect to the shoulders with is actually larger than the standard 3mm. I had to use a lot of clear-coat to thicken up the pegs enough to hold.

You’re right about the shield; that just needed paint plus a 30MM joint part to attach it to the arm. I also plugged a weapon clip from the Kotobukiya Multiple Shield set to hold the sword (which itself comes from the Kotobukiya “Saber and Hammer” set) into the polycap at the top, so that was pretty convenient. The arm-gun is also from the same Kotobukiya set as the weapon clip.

The front skirts are Ez-8 skirts, left over from an Ez-SR kit (I’ve used parts from that kit in so many customs, and the base mobile suit is pretty good, too.) The skirts are also the only place where I cheated in my rule of only using leftover parts and accessory kits, since the crotch-piece that they attach to came from the front of Barbataurus, not the back. I’d wanted to leave those pieces completely untouched, but the crotch-piece for the Barbataurus’s rear frame doesn’t have a place to attach hip-skirts. I guess whenever I build the front-part of that kit it’ll be skirtless, unless I find another piece that’ll work as a substitute.

The head is from a HGBD Core Gundam II; no custom fin, just repainted. The over-the-shoulder guns (which are actually attached to the G.O.O.S.E.) are from the HGUC Loto.