I hope you guys think this is OK.
All I can say is that I've had so much fun with this and I wanted to show you. The excellent build by mattsoft made it possible.
What are we looking at?
Yes, it's a NUC instead of a MiSTer. It's USB3 and RJ45 and a ventilation grille. It works really well and runs cooler than expected. It loads straight into WinUAE (all visual Windows elements removed).
I don't own a 3D printer, so I had it printed out for me and the alterations were made using "analogue" tools.
The black A600 case was bought on eBay.
Thank you, mattsoft.