Dont have an answer for you on the bonded floor. I have found that hte benefit of bonding a panel is to avoid warping sheetmetal. I have chosen to bond quarters instead of MIGing which really didnt save me a lot of time, but had no warping.
EMS makes excellent panels--the best I have seen next to NOS. I used them when restoring a 49 sport coupe and was very impressed.
You will not find any product that will work as good as POR15. They have invested years, and millions coming up with the formula. It's expensive but well worth it. The other bonus is that it is thin and covers very well. A quart will be enough to do a floor.
