The problem with that design is simple - it isn't a MiniMig anymore. You should look into the board presented at
www.fpgaarcade.com instead. No idea that multiple designs doing almost the same appears. My idea is simple: two designs, one high-end (FPGAArcade) and one low/mid-end (MiniMig).
By the way, a 3.0 is in the plan. I'm working together with yaqube to make an "ultimate" MiniMig design that includes the ARM controller directly on the main board. Also, an expansion port for aux. devices and more RAM is planned. But it will still be compatible with the MiniMig 1.1 (with the ARM conversion kit from yaqube). Hopefully, that will be the last incarnation of the MiniMig design. FPGAArcade should take over from here with it's improved performance.