Dual or triple batteries is not brand related. Any brand can use more than one battery as long
as the battery is of the same voltage. In fact, batteries can be plugged in anywhere within a
circuit of servos to move power out close to the servo motor...

I would power all the motors proportionally with the outboard on a seperate throttle mix from
the middle and inboard. This will permit you to dial in props for maximum thrust without having
to drive the RPM at the max.

With the Futaba or Multiplex you can flip one switch and all the motors are ganged on the left
stick or seperate so you can dial in the best thrust.

I'll repeat myself...multiple receivers is not anything unique. However, the number of receivers
per chipping sequence block translates into bandwidth so you have more protection from other
systems within the 2.4 spectrum. Some brands have to have a second receiver to expand their
bandwidth.... I'll let you come to your own conclusion as to whom that is... : )

Antenna placement with either a single or dual antenna was not of any real differential during
evalution. Understand this was a practical evaluation not based on optimum signal strength. It
was out intent to observe the system functioning at X distance without making faux assumptions
based on signal strength and not packet round trip results at the servos.

While this can get extremely technical and often has proven to end in arguments within RCU and
other threads on this subject...the typical resolve is for more channels with as broad a base of
channel servo functional mixes. Remember that servos can be controlled not only in direction of
motion...but distance moved...per program segment... : )

Bombay and retract doors are best opend and closed by mechanical function as a result of as few
a number of servos and channels as possible. Digital servos are individually programmable. This
can permit a servo to travel X distance upon initial signal receipt then with the next step it moves
to another programmed position.

The above programming functionality falls into my previous reference to an If and Then function.
This is actual functional programming to provide exactly what is required with as few a number of
channels aka servos.

You're on the right track....