Hobby Guy, in my first post, I overlooked one item, and that is where you state, " We also need to define accepted power plants for the aircraft. We should state that the models do not utilize any combustion engine of any type, etc."

Now mind you, I don't support the PPP as presented by AMA, however I do admire those individuals - not the corporate protected "bottom suckers" - that get off center and try to accomplish a new framework, even though they may well be and often are, very much in a minority.

OTOH AMA's PPP is right with you. You may wish to visit and become intimately familiar with the program.
http://www.modelaircraft.org/parkflyer.aspx

In the comparison chart of the FULL vice PPP: Emphasis added.
>>>> "Full AMA: No restrictions on type of aircraft that you fly other than established by the Official AMA National Safety Code
PPP: Can only fly park flyers or quiet-powered models that meet the class definition. Internal-combustion-powered models cannot be flown with this membership" <<<<<<

As far as AMA is concerned their PPP membership does not support internal combustion.

edited due to RCU "reformat"