Maybe that's the way to do it. Finance and pay off later.
If you can get a loan prior to delivery, I wonder if payments would be required prior to delivery.
I guess the biggest issue here is:
Speed: Car being delivered May 1. You need to pay by April 1.
Customer: Ok great, take my money.
Speed: JK bro, its now June 15 and we still haven't shipped your car because X, Y, and Z. It's no big deal for us because we are paid
With how the last 2.5 years have gone, it really wouldn't surprise me.
On top of that main issue, there are risks such as damage during delivery, delivered with missing or wrong options, delivered with faulty systems, inoperable, and manufacturing defects.