Buy an Axon, Axon II, or Axon Mote and build a great robot, while helping to support SoR.
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Please take a page from the caveman and don't reinvent the wheel. Buy a cheap RC car and take the controller board attach your hardware and probably some beefier amplifiers. The best part is that some other poor sap has already had to go through the trouble of dealing with the FCC so it's legal as far as the transmitter goes. The whole part of this device not being aloud to be used for anything except its origionally designed purpose... . Anyway I hope this post did not reach you too late and wish you best of luck on the project.
From what I read you seem to be overwhelmed by the project as a whole don't be, encapsulate. Break the project down, what you need is a transmitter, receiver, a CODEC and based on what SomeSaba has said maybe a killswitch. Design each mini-system to be modular so the output is as simple as you can get away with without sacrificing utility.