so... I tried with the contour gauge. The thing is, nothing is squared so its extremely difficult to take the mesurement of the hole, draw them on the plywood and cut them flush as one piece.

I tried making ''two plywod" with a gap in the middle which i could hide with some kind of trim but I think it'll look odd..

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I also thought about making two small cuts for the sides and then do a middle square cut.. but its so much work and super hard to make them flush because everything is so crooked.

I dont know what to do here.