Alsorts its my number 3 forge..I presume the 42% Alumina are hard bricks which will be a massive heat sink. You have a chamber 9" deep, 22.5" long and only 3" wide, heated by 3 no T-burners, which I presume are 3/4". It seems to have a definite purpose in mind.
Can I ask what sort of work you are intending to do in it? Also, what size gas jets are you using?