OK... I think I hate MDF now. This past weekend I spent 3(!) hours on just routing out the material on ONE side of the cabinet. It took so long and I was covered in dust. It also didn't come out perfect but nothing that a little bondo can't fix. It was much harder than I thought it would be to maintain a perfect depth and once you cut below the surface of MDF it loses its "perfect" finish so bondo is basically a requirement here.
I was hoping to do both sides but I ran out of daylight and now I'm dreading going back to it. But I think this is the last major thing to do for the cabinet itself in the workshop before I can start painting.
I'll post pics later... I tried to document what I was doing but it went from setup to final shots because I was just trying to get it done.

yeah, I don't blame you for hating on MDF. The kind of work you're attempting is no fun at all, especially as a first go. MDF turns into a rough hairy mess after routing, that's why surface finishing with fillers is vital to transform that surface into a tough smooth one, suitable for painting. After using Bondo to repair larger voids and mistakes, solvent based primer filler LOVES MDF. It soaks in to the surface, toughens it and allows you to sand all that rough crap away. At least two coats and progressive sanding, and you'll be in a much better place

Happy to help with the Marquee in any way if I can.
