Clone Army Question

At the end of AOTC, we see what looks like early versions of Star Destroyers. Where did they come from? Did the Kaminoans build them, too, to house the clone army?

According to the AOTC visual dictionary and the Incredible Cross Sections book, they are Acclamator-class troopships, built by Rothana Heavy engineering (a subsidiary of Kuat Drive yards, the builders of the Star Destroyers from the OT), who were sub-contracted by the Kaminoans to build the troopships (as well as the other equipment you see the clones using, such as the gunships, and the AT-TE's).

I imagine they had major starships stockpiled already. It was just a matter of converting them for troop and supply transport.