Hey folks. Long time lurker, first time poster. Wow that sounded creepy. Anyway, I have the following issues that I am hoping the people here can help address. The PIT: Dimensions - 48" L x 24" H x 36" W. The cooker has 6 sides to it. I know weird right? It was a pit that was on a trailer that LOWES had out parked out in front of the store. I wouldn't normally have bought, BUT I was able to knock down the price significantly. It's 1/8" steel plate and it leaks like bad plumbing. It has a similar shaped offset firebox that is connected to the chamber via square tube. Very inefficient. Google Carry-on BBQ Trailer and you can see. Don't judge me. The IDEAS: New firebox, lowered smoke stack, and a 2nd shelf in the chamber. What I've DONE: Fab shop built a 24" x 24" x 24" with 2 " insulation firebox. I modeled it from a Jambo's dimensions. Full size door. About a 5" L x 2" W vent. (I know, not close to be long enough.) Opening to the chamber is is 18"W x 6"H. Honestly looks Bad A$$. Also lowered the smoke stack to grate level. Problems: He didn't have 6" pipe, so he made 2, 3.5" stacks and offset them. I think that is problem. I am and not getting enough draft. The pit only got up to about 150*. I know that the vent on the firebox isn't close to being large enough, but I look at the Jambo boxes (with out the boiler door) and I don't see a vent to begin with. Now, the box doesn't have a fire grate in it yet. I used a small charcoal basket I made for my offset Char-griller. I lit some lump, let it get ashy, and through some hickory split in it. Maybe not enough? I have to hold the firebox door open to keep the fire lit. Please help me?