there have been plenty of peeps who have converted similar shelving units into a rack system that has worked out pretty good. however the conversations i have seen have not required any real drilling into but chopping the round legs to fit the height of tubs and most would just lay melamine or other wood materials on each shelf as a seal for the no lid racks. i thought maybe using rivets to fasten the walls to the frame instead of screws but i guess i have the same concerns as others about the long term conditions and reliability of it cracking and warping later on.
but hey u could always sell your car to buy some PVC cages. oh wait...
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back to the drawing board.