Man... I'm not trying to be mean. But, you really need to get a manual. So, you can happily go about your way modifying and cutting on it. With a clear and educated conscience, ya know what I'm saying. And also, I am not trying to steer you away from this board. because there is a lot of knowledge here. But you might want to go check out the Jockey Journal too. Cutting down your cover is covered over and over on that board.
I love Cafe'd Sporty's by the way! Just dont want to see something shitty happen.