If you read the article it says "The cars are engineered by Boston-area Factory Five Racing, which sells the internal structure before Alan Autosports custom-builds the car to the buyer’s exact specifications.
Read more: http://www.post-gazette.com/pg/10235/1081972-96.stm?cmpid=MOSTEMAILEDBOX#ixzz0xXXlEOMW"
Makes the whole idea less impressive…