hatch installation in forward cuddy bulkhead

I would like to install a large (11x15) inspection port...OK, inspection hatch... in the forward bulkhead so that I can inspect/replace the blocks of styrofoam in there. However I am wondering if such a large opening will weaken the boat structurally.
It would be nice to be able to cram life vests, spare parts, new foam, etc. up in the bow.
Gabe
Reno, NV
1973 ds2
It would be nice to be able to cram life vests, spare parts, new foam, etc. up in the bow.
Gabe
Reno, NV
1973 ds2