I've given it some thought and decided that if you build the 51" x 23" x 74" rack you'll really need to include a solid back. That means more than 4 sheets for the 30 box rack instead of 3.5.

Instead, if you made your racks so that each level only held one 1756 (32 qt) or two 1754's (15 qt), you'd end up with a much more sturdy and easy to move rack. This would be with the 1756's sliding in widthwise, the 1754's would slide in lengthwise.

Each rack would be a hair under 80" tall so they would fit under standard doorways. The footprint of each rack would be about 25" x 17" which is very easy to move. You also would have the racks only sticking 17" or so out from the wall, vs. 23" with the previous design.

Each rackwould hold 11 of the 1756 or 22 of the 1754.

The use of material is slightly less efficient but you'd get the other advantages over your previous design, which I think are well worth it.

The advantages would be:

1) Racks don't stick out as far from the wall.

2) Racks hold two different sized boxes (this is a very nice feature unless you just don't need the 1754's).

3) Each rack is lighter and less bulky - easier to move.

4) The racks will be more durable and less likely to sag.

5) The racks could be built without a solid back, allowing greater access to heat sources, etc.

You should double check my math.

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