London Roadsters are factory built cars. As I understand it ,they bought kits from Daytona MiGi ,assembled them on VW pans and sold them as completed vehicles titled as London Roadsters in the year they were completed or sold. I have owned two of these cars ,one since 1994,the other I only had for about two years but sold it after I got the BCW Chevette based car from Pink MG.The car I’ve owned since 94 has been very satisfactory with no problems .Some of these were built on custom made pans using special suspension systems, I have only seen these in brocheres on on the computer and are very rare. I’m thinking that most body parts from your MiGi would fit the LR car in the event you had a need to replace something . As someone has already said ,it would cost more to get your present car to acceptable condition . My two cents worth ,, If it is a good solid car ,it sounds like the best way to go.