1959 TBird Heater Box

[RBabler]

The Auto Restoration Club here in Sun City West Az. was given a 1959 TBird as a project car. The Heater Box/Plenum did not survive the stripping down the body in prep for restoration. Looking at various sites that offer parts for the "Bird" we can't find the Heater Box, so am posting this for advise on how to proceed. Have seen a completed heater/AC setup that can be purchased on the web for $1500. That option is out of our budget for the restoration. Are there any heater boxes close to what we need that could be modified to fit?

Or do any know of someone that has one for sale??