Their glass thickness looks to be minimal, who wants to have to bond fiberglass doors, deck and hood. If you have a desire to build from scratch and have the ability to do so, get a VS kit but know that building a speedster is labor intensive and fabrication skills are necessary. Another option is to buy a VS roller done to where you are comfortable in fininishing the build. (You can get decent build info here ) An unassembled CMC pops up now and then but you need to do a complete and detailed parts inventory as the costs of parts can burna hole in both pockets.
~Alan.. currently on speedster project #22.