If you really want to do it as a GP50 with that model, try using the numbers 1, 8 and 0, either three number or four number. 101 111 181 818 808 888 1001 1881 1111 8118 8888. I think that's all the possible combos. On the ones, make them straight, no little piece on the side at the top.
When you get done with that, learn Blender and try to get a better version.
