Every legacy printer I restore gets mounted to an MDF baseboard before anything else. It sounds low-tech because it is. But it solves three problems at once: mass damping for better print quality, a squaring jig for frames that have gone wonky over a decade, and portability so I can move printers in and out of enclosures.
18mm MDF. Cut all boards in one batch session. Drill brass standoff holes for the mainboard. Mount the PSU vertically on the back edge. Done.
It’s become my standard first step for every restomod build. The printer might change but the foundation stays the same.