The case might fit other computers based on mATX, however the measurements were taken by the millimeter to have the PSU and motherboard as close as possible to each other so that it wouldn't take in more space than necessary in my suitcase.
As many power supply units don't have the same size as others you might have to edit the drawing a bit so everything fits for you. There's only two millimeters of space between the 3.5" HDD's screws and the PSU to give you an idea of how close all the parts in this case really are.
You could for instance move the HDD and have it sit right above the PSU to make space for larger PSU's, just note that you might have some trouble with angled connectors as the cables might push against the top lid that way.
PS: Use 2.8-2.9mm MDF and wood glue.