Please help with this build Albert

[bigal999]

Is something like this what you mean
Albert

[JAZZCNC]

Is something like this what you mean
Albert

Yes but in your case, it doesn't work very well because of the type of rails and the fact the rails are on the front so you have a long way to reach the back of the gantry.
I would either change the rails to top n bottom or drop the idea altogether and go back to your first plan.

Personally I'd be putting the rails top n Bot and dropping the plate because your wasting loads of cutting area and costing your self money in an expensive aluminium plate.