ISSA - International Slalom Skateboarding Association

i am building a board and i have the shape and i have the wood and everything done but i need to drill some holes into it. The board is 20" long and 5" wide (its a really small board) and i dont know were to put the holes! if you could help me and tell me the lengths and such for where to place the holes that would be great!

what i did was take my trucks and trace the outline and the holes on a sheet of metal, then cut the metal out with tin snips and drilled the holes out with a bench press,and voila an accurate(if your not a complete idiot) template for the screw holes, then just find the center line of your board, find the center on the template, line it all up...trace the holes....drill....and your done. if you want to be super precise you could make a ton of measurements, maybe from center to center on each screw hole and line that all up...anything along those lines.