tackle box install

[verch]

Hey guys, I'm considering installing a built in tackle box in my 20' MA. Locations of consideration are 1) in the side of the center console or 2) on either side of the rear of the boat where the top mounted hatches are. I'm a little worried that if I cut a 11"x15" hold that close to the transom that it may jeopardize the structural integrity of the transom. That is however my preferred location for access. Any suggestions or recommendations would be greatly appreciated.