Thank you for taking the time to post Lee, its helpful to us to hear from someone with some real experience on the issue.
How does your program work with Transmissions and diffs, shocks, ECU's and other compliance items?
Also regarding the single source engine builder, how to they handle surges in demand. how long to you have to wait for a motor refresh in the spring or if you blow a motor how long would it take to get a replacement.
Pretty much everything on the car is spec. Shocks are sealed with several (3 I think) authorized rebuilders. Trannys are sealed - CSR's are allowed to rebuild trannys but must get seals from Enterprises who keeps track of what seals went to who for what. ECUs are sealed. Suspension parts except rod ends must come from Enterprises and have Enterprises label on them. Rotor come from Enterprises, calipers are still old Renault parts but new calipers are reportedly in the works since Renault parts are scarce. Brake pads are a specific Hawk pad.
On the motor rebuild lead time - Enterprises has done a pretty good job of managing it. It's rarely been a problem. Not sure if they are still doing it, but they used to post a list of all the motors in the shop waiting for rebuilds so you could see how long the line was and what the expected delivery was.