Edited the center skid plate for the Gen 7 truck to accommodate a full metal RR10 Bomber tube chassis. It can be found on amazon and several other online retailers (typically cheaper from some china site resources) I included a picture since there are a few that are close in design.
It's wider than the stock skid by a large amount and needed new mounting holes to fit. I also adjusted and moved the link mounts a bit, although you may need to add a washer or nut to hold the link in the exact spot as they're wide enough for some links to shift side to side.
I cannot guarantee this will fit other transmissions but I know it fits the Gen7 mounting points for the gearbox!
Note that if you use gen7 axles on the bomber frame you'll want wheel wideners!
Pictured truck uses custom rear lower links, and wheely-king shocks. some cheap 2.2 tires and rims, and custom cut thin sheet metal panels to cover it.