Could you explain a bit how your project is different from the one in the article? Why did they implement the SM83 in HDL when you already have such an implementation?
Also, I don't see any specific FPGA's mentioned, what sort of constraints do these projects have? Does it run on a 3$ one, or do you need something bigger /fancier?
Edit: oh sorry didn't realize MIST is the device, it's an Altera Cyclone EP3C25
I still have that one on my wishlist, there's so much good stuff on the original Gameboy systems that I never could play - our birthday budgets didn't stretch nearly far enough.
https://github.com/MiSTer-devel/Gameboy_MiSTer
Edit: We can also do GBA and a lot of other cores, all the way up to Playstation 1.