I am building a large UAV and would like help in how to laminate the body. I have read that the orientation is important for the strength. 

Have a look at RC model plane sites and forums. What you are building is essentially the same. You will get much better info there. Without knowing all the details like speed, expected g loads, size, wingspan, weight etc. you won't get any meaningful answers anyway.

May I also suggest you buy and built some commercial radio-controlled model aircraft before even considering designing your own. Copying existing, proven concepts will be much cheaper and safer in the long run.

Yes, I realize that , have looked at LOTS of R/C sites, articles and just about everything possible to view on the Web.