I have converted 3 of them. Back in the day this was one of the most popular conversion out there because of it’s light weight and large wing area. My first on was an Astro Flight 40G powered one on 20 round cells. Now I’m running one on a Hacker A30 12XL outrunner and 4S Lipos. If you build light you will be well under 5 pounds.
http://www.rccraze.com/4star40.html
http://www.rccraze.com/440.html