I scratch built a Seniortia as a tail dragger with great success. Move the main gear just forward the Leading edge and either connect the tail wheel to the rudder or provide another servo and use a Y-cable. I don't have ailerons, channel 4 works the tail wheel. I used a 1/2 nose steering kit. It works great. The Kadet MKII was my first trainer. I flew it so much I went through 3 OS LA .40 engines (I teach others to fly). The extra servo will not weigh it down. I hope you find this helpful. Since January my Seniorita have had 5 students and 13 flights on the buddy box.

CANT GO WRONG WITH A SIG. the Mark II is a great plane. Kick out the control throws more for a very nibble airplane. I had it doing down the runway, 6" off the ground, upsidedown. No Joke.

I have trained many people, the Mark II is the best onlly the Midwest Aerostar and the Sig Seniorita come in second. (I had plans and an extra .20 OS LA)

I hope this is helpful.