Hello everyone. I'm starting my first smoker build on a 113gal propane tank- I about have the trailer done and am planning out everything else. What I'm not sure of is how major of a difference is it to insulate your fire box- I'm going with 1/4 plate and 24" lwh. I'd like to also put a top lid for some direct grilling in the fb, as well as having the end door. I know insulating is the way to go but it would be a lot more design and labor that would expose my lack of fab skills, and if its not a huge advantage then I'm not going to. Thanks!