I would lock the flaps in the up position until I had a 5 ch radio for the model. Otherwise... sounds great.[8D]

The method you describe for controlling the flaps... would be somewhat difficult to set up, and could cost you the model.

Yuo could if looking for some added interest... link the cockpit canopy to the flaps... whent he flaps go down, the canopy slides open. (but thats going to add weight... and might not be a good idea on a small electric aircraft.)