Hey everyone, I was just wondering if anyone knew if the Firespray was Imperial designed or Mandalorian?

Kuat Systems Engineering

The Firespray-31-class patrol and attack craft, or Firespray-class starship, or Firespray-class interceptor, was a patrol and transport starship designed by Kuat Systems Engineering initially for use by the Republic Correctional Authority. The most well known of the starships was Jango and Boba Fett's ship, the Slave I.

And all of the above, and much more can be found at:

http://starwars.wikia.com/wiki/Firespray-31-class_patrol_and_attack_craft

Basically just google the ship name/type and the word wookieepedia

Thanks, but now I'm confused. If Jango destroyed all but one of the ships and no more were created then how did Kath and the others have Firesprays?

All but one prototype. The ship was put back into production later.