Why such a tall gantry? Your effective cutting depth is limited by the distance from the tool tip to the collet and you can't really make much use of all that height.On top of which,those tall skinny gantry side plates are quite likely going to flex unless you add some stiffening.It also looks like a single central ballscrew and that can be prone to skewing the gantry.I suggest a revision to reflect the thickness of material you will actually be cutting and a 40mm Z travel may be more realistic.