Coming along nicely. One thing to note, AFV Club got the gun mount wrong. They were actually M55 quad .50 cal mounts (M45 on M20 trailers) that where wheeled up into the bed. The pedestal was not welded/bolted to the floor like in the WWII M16 halftrack.
Jim “Gunny” Lewis shows how to build it properly at his website; Guntruck Studios.