Hello Doug,
Thanks so much for your kind comments!
Actually I would like have it done at 1/3rd (33%) but that size will be unmanageable, not to mention the higher cost of engine,and additional radio gear.
The pictures you posted, are actually a 1/6th scale Helio I built long time ago when I used to serve with JAARS People, yes, slats DO work tha same as the real Helio, I duplicated its mechanisms.
Slats will have their own linkages, rollers, tomahawks and their respective torque tube