Quote Originally Posted by Zeeflyboy View Post
... you can quite literally get rid of all unsupported gantry side arms and it is certainly easier for alignment purposes than side mount.
In case it is not obvious you have trapped the long axis rails between the gantry sides, which means you cannot easily control the pre-load on them when it is all assembled.
As drawn the side extrusions which sit on the bed - one of them needs to be adjustable laterally so that the pre-load on the rails can be set. Otherwise if you bolt this together rails may wear prematurely or bind.