Nr1madman, you're right there is a space between the linear bearing and the plate. I was thinking to add a 20mm spacer.
Click image for larger version.  Name: Space linear bearing.png  Views: 1253  Size: 164.7 KB  ID: 23115

Thanks for your advices, I will do the changes. In my actual design I have a another profile in the middle of the left and right profiles, but I will add more.
routercnc, nice idea I was thinking that I can order the profile already cutted.

Thanks everyone ;)

And what do you think about the linear bearings?