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Yup , I think it is the viper frame. Instead of the front servo being vertical, or parallel to the main shaft , it is at a 45* degree angle which moves the servo horn back 3 or 4mm`s.
You can even run the Z20 motors , or motors that are 43mm in diameter, and use as small as a 13 tooth pinion.
These are some of the s3150 Futaba digital servos on cyclic. Some of the best servos that I have used yet. Course they aught to be , they are like $56.00USD each...
Also ,I`m using the Trex500 landing gear. The look real nice I think...
EP8 EX twinring frame
Quick of Japan