Dont add weight man. Just go with the mount that they give you but be sure to use 30 min. epoxy on it. Dont worry about turning the saito .72 upside down. This is how mine is mounted and it does great. The only thing I would do different is to build the horizontal stronger. The plane has a problem with breaking the tail off (mine did it twice at below 1/3rd throttle, level flight). Go with a solid horizontal and maybe even solid elevators. Be sure to add flying wires (not included) and you should be alright. I have also seen one that had small gussets on EVERY corner in the horizontal and elevators and it stayed together fine.

Just whatever you do, dont ask the company anything. Hobbicos support sucks!!! I called to let them know about my hoizontal failing on me and told them that many others on RCU had theirs do the same thing. All I got was a "hmmm...thats weird" out of the guy. Its a great plane (when you rebuild the tail) but the customer service SUCKS and for that reason I am never buying anything else from them.