Yea, they're a pain in the A$$ to install. We don't drill holes in sheetmetal as a rule in any of our projects, but the drawers are the exception to that rule. We attach them at the middle, and then install a tie down on the outside aft corners and the front corners to hold them down. Those attachments points will keep you away from the fuel tank placement for the most part. Keep in mind that you want them fairly secured, because they'll give you a BIG headache in case of a car accident.
