[gjbingham]

Gotcha! The side to side size of the base is determined by the outside diameter (OD) of your oven plus the amount of insulation you're planning on using, plus room for the enclosure you are planning. The front to back size is that same number, plus space for a landing, if you desire one.

Use the number of blocks that gives you that total area or a bit more without cutting the blocks. That makes life easy. If you haven't downloaded the e-plans from the FB store (free), now would be a good time to do it. If you have, review that section on building the stand.