Actually the LeSharo (Renult) is a Van conversion, unlike the Rialta. I know it looks like a Class C, but it started as a van. (unibody)
Having said that, I wish the op well, and hope he never needs to find parts, or have a clutch replaced. I heard $5,000 for the clutch, and that was a few years ago. Maybe the most under powered RV ever built in the US. If the op is a good mechanic, who enjoys a challenge then the LeSharo may be a fun project.
They built both a gas, diesel model.
Here is the original brochure.
LeSharo pdf