G.R., you asked:
"So today if your Speedster body is based on a vintage VW frame/pan and is SPCNS titled will the DMV allow it 'collector status' ? thus allowing you to run YOM plates, or does the car not have to be 'collector status' just body style like a '56-'57 Speedster?."
The short answer is, "No.". SPCNS vehicles and replica cars do not qualify for YOM plates based on what they represent. This comes from the CA DMV: ath:/dmv_content_en/dmv/pubs/reg_hdbk/ch21/ch21_36" target="_blank">https://www.dmv.ca.gov/portal/...eg_hdbk/ch21/ch21_36
SPCNS cars especially don't qualify as the chassis has been constructed of new materials and although donor parts such as the axles, motor, trans, etc. may have been used the vehicle will not have a VIN number from an old car. It gets a SPCNS registration number once inspected by the DMV. A pan based car has the pan from the donor car and that part has a VIN number associated to it.
In order to use YOM plates on a replica vehicle a major component of the vehicle with the VIN has to be included in the build. So for instance, my VS built Speedster has a 1960 pan so I can legally use a yellow background black lettered/numbered plate with a 1960 sticker affixed to it or I can use a black background yellow numbered/lettered plate.
Based on the DMV's limited description on their website in order to legally use a 1956 yellow background black numbered/lettered plate with a 1957 sticker affixed to it on a replica car the pan would have to be a 1957 pan and the plate could have to have a 1957 sticker attached to it. You would need two plates in serviceable condition with one of them having a legible 1957 sticker affixed to it.
There may be another way around this but i don't know what it is.
This guy is in the business of selling some very expensive YOM plates and his website is very helpful also:
http://www.oldplateguy.com/YOM...fornia-Vehicles.html