That's very heartwarming, I love these stories. If I wanted to do this, I'd probably just re-arrange the buttons in such a way that you'd lay your hand flat on the controller, using the index and ring fingers for analogs, your thumb for A/B/X/Y, middle finger for trigger, and maybe your baby finger for bumpers or something (I'm using the XB360 controller as a base because I don't own a gamecube), but his way looks much better. I'm sure his brother would love this, if only because of the thought put into it.