thanks Dot_Kappa : the plywood has different meterials on each sides, one is very rough and the other is smooth. and i will use a circular saw to cut the slopes. Burnout21 : i did something like that, but i only had a crappy hole drill thing, which messed up the back side of the wood a bit. grritsshawn : because my other project is 3000km away, and for now its too expensive for me to finish it. tomclancey, LooseNeutral : i can make a small tutorial in the modding section if you are interested. It's not very complicated and doesn't take much time to set up.