I did this with 100% infill in PLA on a CR10-s you will need to drill the holes that mount the side rods but the aluminum plate it is mounted to has the holes in it .I made this so that i can change out my motor and gearbox in one go with 4 screws .No need to re lash the spur and pinion gears as they get set and left on the trans plate . I have one plate set up for rock crawling with the stock motor and gears . And one plate for trail riding with a 20 turn motor and 19t and 80t gears. Just change trans plates as they have everything on them.
One more thing get extra drive shafts and mount them the same way on both . That way they just slide in. There are holes for easy access to the drive shaft grub screws on this model . Was made on TinkerCad