I think the major thing he was stealing money from people, i.e. like people would give him their vipers to work on and he would ask for more money from them to work on their cars plus the initial cost of a kit(which was a pretty penny in itself). So to sum it all up he robbed people blind and got away with it for awhile and then got caught. He got sued and his hangar workshop taken away and all his fancy stuff, all his employees left him, and now he working out of some rickety old shack. He got dogged on by many a viper owners for awhile, so i dont see how he is still in business.
-I think thats how it pretty much goes- I dont know if its the exact details but its a pretty straight story