Sure you do; it's the fleet of RBSL re-engineered Ajax rather than the more common CV90, but still...
Ordering bespoke is different from ordering off-the-shelf, and there are plenty of things you pay for before you receive anything. Even with off- the-shelf, there is a delay between money down and goods arriving*.
I wouldn't want to claim that the contract with GD is a good example of how to procure anything, it obviously isn't, but demanding retroactive change isn't necessarily going to make it better. Use it as a cautionary tale of how to do things differently next time, but don't think you can rip it all up and do better this time.
On a similar vein, how many trains have run on HS2, how many Type26 are in service? How many Challenger 3?
* Granted, some arrangements do allow for credit