I look at all the high-dollar RVs in the yard where I keep (and work on) my bus, and I know that when I've finished the conversion work I'll have something better than anything in the yard, better designed, better made, better functionality, for a tiny fraction of what it would cost to buy an RV even half as good. I reckon I'll have spent $25K to $30K total, including the bus itself which was at the top end of the typical skoolie price range, the complete solar system (it cost almost as much as the bus itself), and all the upgrades and improvements I've made along the way. And I don't begrudge one cent of it. It's the best thing I've ever made or done, and it will potentially allow me to have an enjoyable and interesting retirement with only a moderate income.
John