Having made several cyberdecks over the years and run the whole Pelican case thread longer than ideal, it has been about making custom one-off builds. There are really no limits other than attention span, budget, and design/build skills. I've seen some held together with hot glue that are just as cool as others from those with access to CNC facilities. Personally, they have been a great vehicle for me to push my boundaries in 3D printing and get from Tinkercad to Fusion 360, having fun the entire time.
(of course a plug for https://doscher.com)