This is a flat battery tray made for the trx4m. The tray has the same dimensions as the OEM TRX4M Bronco battery tray. This tray is ideal for relocating or mounting esc's and receivers.
Sorry for the delayed response. It is the TRX4M Warthog chassis. I purchased the .stl from cults3d and printed it myself. I believe the original creator also sells the chassis kit on etsy.