The Butterfly T1-2024 performs remarkably well at low speeds, offering stable and easy control, making it ideal for indoor flying. Link: www.minimumrc....
It would be nice if you could make a PNP versions of your models which has all the electronics incuding a battery and a charger, but no transmitter. Buying everything separate makes it very expensive. When I built your B-25, I used a Volantex 400mm warbird 4in1 board and it costed only little bit over 20€ + one extra servo for the ailerons. Nothing else was needed.