Just got this update from TXDMV:

"We just received notification that the Custom Vehicle and Street Rod Program is in effect.

Attached is the registration bulletin that went out to all county tax offices, as well as the required forms to submit to your county tax office.

This registration bulletin will eventually be placed on our external website for the public to view. It will be located at: http://www.txdmv.gov/tac/rtb.htm The applications will also be made available on our website soon.

Thank you,"