mine has an os 160 and i am running 2 605s to the elevaters with carbon fiber and a belcrank pull pull setup to relieve any pull on the 525 on the rudder.all servos are pretty much in the standard place and the 5 cell pack is is about 2 inches behind the trailing edge of the wing to ballance at 5".standard landing gear with aluminum spinner.My horizontal stab neaded to be shimmed 1/8 inthe front to match the wing incidence.Nice flying plane but needs almost full rudder to knife edge.If i assemble another i'll use a big moki.