That's been on hand since at least 2005, and the frame and transmission offer ample space for a battery and the relevant control circuitry.
I stripped the paint from the shell, and added some 3D printed open grilles. Those might help dissipate heat from the battery and radio control module. There's a fair amount of work involved fettling the sides and fitting the grilles.
Perhaps the original owner gave up on finishing the model because adding couplers is a challenge. If there's some spare 1/4" x 1/2" brass bar on hand (from scratchbuilding tenders) there's a way forward.
There's enough space on the upper side of the frame to clear 4-40 nuts holding the works in place, thus these pieces will be drilled No. 50 and tapped 2-56 at the spaces marked T, and drilled No. 31 to clear 4-40 at the spaces marked C. These still must be shimmed down a bit to get the coupler heights right, but the short coupler casings will clear the gear boxes on the powered axles.