The shelf is made of 3/8 plywood and is reinforced with a 2x3 on each side where the bracket screws into. will have to fill an empty fermenter up with water and see if it holds it might have to put a 2x3 across the middle at worse case. The box is going to weigh over 100 lbs. especially with the fridge on the platform so i doubt it will tip even with all 3 drawers out. Also my basement struggles to get past 60 in the heat of the summer right now the room i keep my fermenters in is around 50 - 55 degrees. That little section should be able to get cold enough to do most of the fermentation for a lagger. When i actualy have to lagger it at 30ish degrees i plan on putting it in my keezer.