First and foremost, the credit for the winger design goes to Kwicklabs. I started with information on his site, threw in a few ideas from posts on RTF, and used a little bit of my own engineering to put my wingers together. The cost is not as low as you may think, but significantly less than buying commercial units. I built three wingers with electronics for approximately $525, but three commercial units with electronics would have been approximately $1,800.
I did the same, and I also give credit to KwikLabs. I posted a while back with a pretty detailed diagram of how I built my electronics. It is on page 2 towards the bottom....there are other pictures you will come across first (with like a green box....keep going down past that and you will see my electronics that I labeled). If y'all have any questions...shoot me a PM and I can help!
I forgot to get back with you with pictures of my wingers, I apologize. There are three general pictures above, if anyone wants a picture of a particular part, me know. Again Kwicklab started the process, Jeremy and others helped me out, and I also incorporated a few of my own ideas.
My changes included building a longer winger, therefore I used 3/4" PVC instead of 1/2". I did not like the oversized cylinder design so I made bushings that fit inside 1" fittings to make the hinged sections a snug fit as well as eliminating the non-glued section at the base of the winger. I used carymart electronics, but I used two channel receivers so that one receiver could operate both the siren and the actuator, which cuts down on the size of the electronics box.
At first I was skeptical of building my own, particularly the electronics part. But, after I jumped in it really wasn't that hard. Like Jeremy, if you have any questions shoot me a pm and I can help you out.