OK, here is my first forge. The box is made of 3/16" plate. Inside measures 4" wide, 4-1/2" tall and 12" deep when measured through back door. Back door opening is only 2-1/4 tall, arched. Lined with 2600 degree 2-1/2" SFB, then SFB mortar, then Metricote (not in pic). Burner is standard 3/4" side arm burner, mig tip. For the flare I used a 304 SS concentric weld reducer 1" x 1-1'4. The base is made of Dana 60 and GM14 bolt parts, ie heavy. Have not fired her up yet, hopefully this weekend. What do you guys think? Be honest. I learn from my mistakes$$$. I am hoping to use this for knife making mainly. Will it work? Thanks for any input or advice.