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I'de like to help ya out but mine is minus the SFB. I did the mod to the exhuast vent (added 3" dryer vent down to grate level. I just bent the sides in/out to make the lid fit a little tighter. Didn't go the oven door rope deal as it sealed up pretty good just bending the sides. I made a little charcoal basket to fit at one end. It does have some air leak issues as far as trying to shut it down, So I just use the amount of charcoal I need to maintain temps @ 225. sorry I couldn't give advise about the SFB tho. I'm not sure I want one as it will use a LOT MORE fuel than what my little basket uses...
HMMMMM... can't find my pictures of it.. oh well.. there's one in my profile
For the price (170ish on line Wal-Mart) I think it one of the best off the shielf. If you do every mob you can find + a few you won't find it can be a very good smoker. One mod that I came up with is to line the cooking chamber with 10 layer of HD aluminum foil, I couldn't believe how well it work. I also made a propane pipe burner that I can replace the ash pan with. It works great for doing long cooks, like butts. for ribs and chicken I remove the propane pan and slip the ash pan back in so I can use charcoal.
You can cook 5 7pound butts or 35 chicken thighs at one time. I know because I just did it.
Do you have pics of those mods Tom C? I have the Char-Griller Duo. I did a bunch of mods to it and it works very well. You do have to watch it though. It is not a set it and forget type deal. But it is the old school way. Search Char griller mods and you will find a bunch of info and opinions.