Here you go
Using the ofna bulk head and moving the engines in all the way.Then place the second pulley to get rid if the slack.This way the engines don't push the outside of the box.Placement of the second pulley is tight but just fits
beside the wheel.Measure twice drill once.If you miss the next hole to correct will be half of the mistake hole.Things get tougher then.
This box is still by far the best if you run losi buggy and truggy.One box starts two rc=priceless