I'm assuming that the model itself is one-and-a-half 'Hank's, so...
is designed around a Bec motor unit, which would put most off.
...I'm not sure why, because my homebrew truck that post-dated the HAWE and pre-dated the new trucks, runs beautifully, based on your chassis kit. Equally, if you're still getting sales for the chassis I'd take a Tenshodo version... Or agnother BEC version, with sides 1mm higher (remember the DCC episode? No, I think I'm joking about that last. Probably).