As promised, I leave the file and a print screen of the work here. Through the print screen you can see that I don’t have much free space on the sides, space that ends up being occupied by the protection of the laser module which measures 40 x 40mm.
Tile Display Stand Group Natal2024.lbrn2 (19.7 KB)
The Christmas presents had to be delivered without the displays stands but patience. They will be delivered later. 
I currently have a back pain (a health problem) which prevents me from literally lean over on the subject.
I can work on the computer but lean over the laser machine to place, adjust and remove parts, no way.
So I’m watching the videos you suggested and drawing conclusions. 