I have built two of these planes. The first had the BME44 on it and the new one has the BME 50. I added absolutely no weight to either one. Obviously, they had all the power ever needed. I am running a 16 oz fuel tank in them. You mentioned that you wanted to use a 32 oz, this will give you LOTS of flying time and LOTS OF EXTRA WEIGHT (in the neighborhood of 2 pounds total) I would think twice about that.

I ripped all the coveing off of both of mine and gave everything a good looking over. I found a couple of pieces of the frame work that had been broken and then glued back together. There were other issues, but they were all fixable. With the covering off, I drilled a ton of lightening holes to reduce the overall weight. Bought the carbon gear from Troy Built Models. I had to machine my own motor mount to get the engine to fit the way that I wanted it to.

The incidence was W A Y off on the first one and just slightly on the second. Again with the covering off I was able to fix the incidence on both the elevator and the main wing. The piece of the rudder that you will glue into the tail end of the fuse will need to be trimmed to get it to fit flush. I also trimmed the corners off of the elevators to obtain a full 40 degree of throw on the rudder. I simply used a saw to cut the corners off and it needed no reinforcement ( again I built 2 of them like this)

Hope you can make use of some of this info.
Jeff