Macck just did one and posted in another thread... can search back and find that.
Which revision are you wanting to do? They handle power a little differently from what I gather but should be just as straight forward as doing a 2+ slot mvs.
men. help me. i must find and buy one. I dont have enough room for a cab, and ive been playing the neo for a long time and have never gotten to play a Hyper 64. Im ready to take the plunge.
If you have a Rev1 Hyper, you need to make certain the extra -5v line is connected. It will work without it, but prolonged use will eventually burn out the board (and the game plugged into it when it goes).