quick and easy to figure out the angle is cut your side pieces for the box... then use a small piece of mdf to help figure out your angle for the front baffle..or a scrap piece of wood just play with it till it works it m...i put mine together in this order when i had this style box... bottom, sides, back, front baffle, then the top... and you really have enough airspace for a pair of these subs and trying to knock out a side wall like that could end up tearing up the box lol mdf doesnt like to come apart without a fight sometimes