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There are a few flaws in your hypotheses. First a helicopter is not really the best camera platform. A helicopter has fewer and slower moving rotors but that leads to more vibration. In small scale (as in not carrying people) the inherent stability and vibration canceling of a quad (or greater) is a benefit.
Another is the misconception of electric motor efficiency. Having more lightly loaded motors is not noticeably worse. At light loads and higher RPM electric motors are more efficient that more heavily loaded or lower RPM (within reason). A tri-rotor is not going to be as maneuverable or stable as a quad. Quads yaw (rotate on axis) by varying the torque of opposing rotors. Tri-rotor will be harder to fly without equal number of opposing rotors. Many remote controlled camera platforms go one further, stepping up to 6 or even 8 rotors.
Where a conventional helicopter wins out is safety. A helicopter can glide without power, where multi-rotor aircraft can not. For carrying people that is a must.
The "Apple" like restrictions on altitude (at least in the US) is a regulation you will be required to comply with whether the computer is in control or a human is piloting the craft. Please leave the higher altitude filming to maned flying platforms and keep the "drones" below 400 feet above the ground (AGL). It's the law.
As far as building your own, anything is possible. The part combinations are endless. From 1/4 pound FPV racing quads to automating full size aircraft.
Hope this helps.
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