The unofficial port of Road Blaster to the SNES, called Super Road Blaster, is quite the piece of work. It would have been a game that would have run with a SNES CD-ROM attachment, but no such device ever made it to market. The game is very, very large, clocking in at 753MB. On real hardware, it has been only able to be run on an SD2SNES. However, the SD2SNES costs about $190 for the bare board, making it quite expensive for a homebrew release.
If you were to make a homebrew cartridge, I would suspect that you would need an 8 Gigabit NAND Flash memory chip, logic level translators, a battery backed S-RAM chip and some kind of chip to implement the MSU-1. In addition, you would need a cartridge and labels and perhaps a manual and a box. Is this feasible at a $50-60 price range?
If you were to make a homebrew cartridge, I would suspect that you would need an 8 Gigabit NAND Flash memory chip, logic level translators, a battery backed S-RAM chip and some kind of chip to implement the MSU-1. In addition, you would need a cartridge and labels and perhaps a manual and a box. Is this feasible at a $50-60 price range?