I did my G-36 myself and while not as "pretty" as Robar's work, it fits my hand like a 1911 with thin grips. I used Brownell's glass bedding compound after protecting the "works" with kid's Play-Doh. It took about six hours of work (not including the 24 hours to let the bedding cure) and because it left a little to be desired cosmetically and was a little slippery, I added a sleeve cut from a 1-3/4" bicycle inner tube to give me a non-slip grip texture. This is my everyday carry piece and I'm really happy with the way it turned out.
Brownell's website has a detailed tutorial with pictures that you can download. I'm an amateur gunsmith at best and if I can do it, most guys with minimal mechanical/artistic/tinkering skills can do it. Go easy, think before you cut and have fun. Projects like this are rewarding as hell.
Best regards,
Rabbi