Troy,
The way you are will work, but I believe it will not be very efficient or durable compared to something else just as easy.
If I was making a starter forge, I would find a piece of pipe, square or round, and line it with Insowool or Kaowool and stack soft firebrick in the back and where needed in the front allowing space for a door. If aquiring a pipe is out of the question, I would still use the soft brick and stick it with furnace cement or just stack them dry. The hard brick work, seem to crack a lot to me.
I saw where someone made a coffee can forge. You might do a search and find it. Lin