[mrwright]

One of the things that I noticed is your belly pan appears to be attached directly to the bottom of your rails. We did this a couple of times and the screws eventually came loose and the belly pan dropped out of the bottom.

I would make sure that you have plenty of support especially around the battery. You could possibly attach some angle brackets (like in your corners) and mount the belly pan to them.

Also, does your cutout for the gearboxes have enough clearance to remove them without dropping the pan out?