Looking good Bofred but I see a potential trouble spot that could be made much stronger for not a lot work.? . . .

The gantry rails mounted directly to the profile with no reference edges for alignment and support could slip under use just hanging from the rail bolts. I would mount rails to a piece of plate with machined reference edges that is same width and height as gantry then mount that to profile. It will massively stiffen the gantry and allow much easier setup.
I would also put a slot in front of plate for ballscrew bracket to come thru which will offer protection to the ballscrew/nut.