I'm drawing up the gantry plates at the moment in Draftsight so should have some CAD models soon. I'm in two minds whether to do the end plates with slots in so the top/bottom/front plates are located in the end plates (remember seeing something like that on a build you did for someone) or whether to fit the end plate on square to the ends and have less machining?
Yes I'm waiting to get all the bits in my grubby paws before doing the final drawings just for that reason, so I can check all components are as they should be...