Would be pretty easy to make if you can lay fiberglass or CF. That being said, gauges that far away make you take your eyes off the road for too long, and every time you hit a bump the glove box is going to bounce. It would just annoy the crap out of me. If you want a clean install, relocate the climate control and put three gauges there, and maybe the ash tray because we all know that nobody smokes in a MKIII.
I'm sure you could fab up something to stop the glove box from bouncing, but even still, if I were putting gauges there (which I'm not) I'd get ones with warnings for maximum/minimum sweep on the gauge so you know if you have a problem by the gauge beeping at you. That allows you to keep your eyes on the road. And get a minimum of 60mm gauges, as 52 would be too damn small to see while buckled in and trying to keep your eyes on the road. Not to mention potential sun glare blinding you from various angles depending on where the sun is.
Another option is to hack a spare gauge cluster and install the gauges in there. Find some that match the OEM setup fairly well and have at it with a Dremel. That'll be clean, and make it so that you can put the rest of your gauges in the center console, leaving the glove box free to store your favorite cassette tapes. LOL.