weld a sheet that is FORMED to the area... then smooth over the seams. LOTS of filing before you go putting ANY filler on there much less bondo..
and if you put a screen and bondo'd over it... it would last MAYBE 6 months before it just started popping off... course that's only if NO ONE ever touches it. and you NEVER bump into anything backing up... then it'll just colapse.
Make sure you've seen a hatch w/ it done before you do it though cuz the one's I've seen look ill-poopy even when done right.... imo
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I am an A$$hole... take anything I say to heart at YOUR OWN RISK...
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