30 CFR § 203.90
What is in a fabricator's confirmation report?
July 29, 2020
This report shows you have committed in a timely way to the approved system for production. This report must include the following (or its equivalent for unconventionally acquired systems):
(a) A copy of the contract(s) under which the fabrication yard is building the approved system for you;
(b) A letter from the contractor building the system to the BSEE Regional Director for your region certifying when construction started on your system; and
(c) Evidence of an appropriate down payment or equal action that you've started acquiring the approved system.