Hid a pc into a bar of my mobile home this way. All parts were either screwed into plywood or strapped with zip ties. I hated the wasted space. It had a 24x28" space with no door (Fixed with a scroll saw, magnetic close, and some hinges). I added a very small plywood shelf for DVDroms and usb drives, and just attached the board to the inner wall. Used a hole saw on the tabletop for I think 2" (just big enough for a VGA connector, and ran all the cords into the cabinet. Worked well, then I moved into an actual house. Still loved it more than apartment life. Coolest part was no one ever saw the door unless I showed them (which was great cause that cut was waaaaavy)
A mobile home doesn’t really mean mobile always. In this case, just moved from one area to another. A trailer home. Wasn’t bad either, 16x60, insulation sucked though. I had industrial laminate from an old shoe store, copper pipes, landlord let me keep a 20x20 yard and 400x20 garden, for $100/month (8 yrs ago). Paid $3k to buy it preowned, 2k to move, and about $500 in cleaning and repairs (floor and various things were free sourced mostly), sold it after 6 years for $3k with no cost to move it again.