Guys'
I think your on the wrong track here. The engine mount, thrust washer and cowl alignment shouldn't be off and the stab and wing are factory set. I found when I mounted a YS 110 inverted that there where four possible variations of engine mount and engine. Engine on top or bottom of mount and the engine mount itself can be turned over so I had to figure the right combination to get the thrust washer and spinner centered on the cowl. Once this is accomplished you will have the factory settings which are correct. I think the reason they don't give them in the basic instructions is that you don't need them to successfully build this model.

As for weight, even with the YS 110 I was able to place the battery rearward and get it to balance fine. It slows down a lot for landing and flies very well.