It's not for the weak of heart, and I wouldn't recommend it for someone who hasn't built an RV previously. I'm not saying it would be impossible, but it will be even more of a challenge.
Here are some pictures I took of the retrofit I did. This fuselage wasn't quite complete when I did it, so it was easier than it would be on a complete, and flying plane.
Wally Anderson at Synergy Air in Eugene, Oregon did one for a customer. He told me he'll never do another. Give him a ring for more info... www.synergyair.com