Zippi,

I hear ya, running the strokers inverted can be a real pain in the arse, but you will be OK with the Saito inverted.
You just need to watch the fuel tank position in reference to the carb, just try to keep the fuel tank center in line with the spray bar in the carb.
Other alternatives to resolve issues with inverted engines and badly positioned tanks are; Perry pump, YS engine with pump like the 110 FZ, or any other pumped engine.

Thinking about this plane too, with a Saito .82. I have a Saito .91, but I don't think the extra power will outway the extra weight over the .82.
Whatever I decide, I want it to be right from scratch.

Tripp