Re: exhaust exiting low- many good offsets have their exhausts mounted at about center on the end of the chamber with a 90* elbow, opposite end of firebox. This keeps heat and smoke at grate level where the grub is.
Agree with dawg those ex. pipes look too small and too long. Make em bigger, fix that firebox inlet and you'll be cookin with smoke!
UDS'-55&16, Akorn, Bar-B-Q Kettle, Drum Grill, miniWSM, cobweb-covered gasser. I'm JD.