Hal, I kind of just went with the layout of the original Melco for that. I figured it was a good place to start. If I really put my brain to it, I could probably fit four on a board not much bigger than the one I have now. I’m trying to stay away from surface mount components because I don’t really have the means to solder them efficiently. Heck, if I went SMD, I could fit 6 on a board the size of the original. Through hole soldering is much more friendly for the home gamer. I was thinking I could fit four on a board about 4x6” pretty easily.