I received mine, I started the subassemblies and I started to think about my retract instalation.
As I said earlier I'll go with a 120 surpass.
My first idea was to make a side or upside down instalation for cosmetic reason, but i think i'll change my mind and install the engine upright.
reasons for this are

1) there is a big portion of the wing to cut in case of side instalation (i plan to shorten the engine box one inche for balance consideration)
2) side or inverted instalation mean that the exhaust will be on the bottom, and will blast oil and exhaust residues on the servos and in the weel well

one last consideration. When you know that Bruce work with bandsaw and conventional tools to cut the kits, this guy make an incredibly accurate job, he really has laser eyes