The R/C car from HPI that you mention is really only the body. HPI does sell onroad R/C cars, but the Elise body is a separate product that fits their cars along with other R/C onroad cars. I have a Team Associated NTC3 Nitro car with the S1 Lotus body on it. I will post pics when I get home. I have also purchased the S2 body for my R/C car, but I mucked up the paint process and it looks like poo. I plan to purchase another S2 body and try to make it match the car I am going to purchase perfectly. BTW, the little sucker goes about 50 MPH. It is scary fast. The engine I have generates about 1.2hp with a 2 speed transmission and shaft four wheel drive. It is about 16 inches long. Putting it together was one of the funnest building experiences that I have had.
I love it when two of my hobbies merge.