It is not a six week time frame as so many factors effect build, transportation etc. My original build date was March, but then built May 11 and picked up by me in Quebec City June 5. Transportation alone can add time as there is only a train ride to get a car to Quebec, where it is train and then transport in Detroit to get it to Ontario. Some people have waited weeks longer for loading and reloading of transport. I was at 3300 when my build date was put back due to a manufacturers constraint (Spectra wheels) which caused quite a worry as GM tells you your order must go through as is at that point and changes (I simply wanted to change to basic black) could not be made. There is NOTHING...and I mean NOTHING comparable to the first time you sit in your Vette after that several months of hell! NOTHING!!!!!!!!
Oh and with respect to Spring dates, you will see cars start being built and delivered West to East because of the weather.