The only SAFE way to register a special construction vehicle in this state is via the SB-100 route no matter where yo bought it. Two people around this area had their titles pulled because they tried to register the cars as what they were registered as in another state.
Also you can't have a turn key cut built and register it under SB-100 as another person here found out. He had his Cobra built by a company completely ready to go and registered it under SB-100. About 3 weeks later he received a letter from the DMV to send in the title as it was a turn key car. He finally had to sell the car out of state unregistered.
Ron