All in all Henri, an excellent job! There is nothing to keep you from ordering your board. I even took the liberty of panelizing it for you. Although I'd not use the panel I provided (it's always better to let your fab shop do the panelization), it was a fun exercise.
Just an FYI -- I tried the file on tracespace.io and it's still spinning after five minutes -- might be too much for it.
As for ordering -- you've got 2-layer and 4-layer boards. 4-layer are twice the cost of 2 layer -- so you'll want to group the boards accordingly. (no need to fabricate a 2 layer design on a 4 layer board).
All in all, a neat design -- I can't wait to see it in physical form. Do you have a 3D render?