IMO, the Brio is not a good platform for DEPS. I built the standard kit, and I'm not sure where you would put the servo. The balsa tunnel floor isn't really structural and may be too high. Going aft of the tunnel would be difficult to access.

I’ve done three roaches with DEPS and the Brio with duel servos in the tail. The DEPS always requires trim changes each time out where I haven’t touched the elevator trim on the Brio since the initial flights.

I kept the stock rudder and used 3421SA’s in the tail and did not have any balance issues with an OS140RX up front.

For the horns, I made some from 3/32 ply and laminated with CF. A slot was cut in the elevator using a Dremel cutoff wheel just catching the hard point (this would have been inboard enough for DEPS.) The horn was epoxied in after covering. The main reason I did this was to get the pushrod attach point over the hinge line…it’s a long reach with the top hinge! The whole process worked out so well that this is how I will do all horns in the future. No more MK horns for me.

What do you hope to gain with DEPS?