Hey everyone! I am new to forging. I just started with knife making. I hand made my heat treat oven and my 2x72 belt grinder. I'm pretty handy and enjoy the challenge of making it myself. I am wanting to build a forge and have some questions. First, the forge will be used primarily for knife making and small blacksmith projects around the house(making closet hooks..etc...the wife has a list) I would like to have the ability to move up into damascus at some point. I have been debating a 5 gal airtank design vs an 11 gal air tank design. the 11 gal air tank has outside dimensions of 29-3/4 in. x 21 in. x 13-1/2 in. My thoughts would be 3 layers of 1in kaowool, 1/4-1/2in of refractory, IR coat, hard brick floor. I would put doors at both ends with a slot opening in front door. I want to build a NARB for it which brings me to the question of how big a NARB do I need? I am estimating the chamber to be 622 cubic inches before adding fire brick floor if I use the 11 gal air tank. It would be about 5in high by 22 in long. Thank for any and all advice!