The Terra Cotta paint color on the 810 Crane Car is very difficult to match, for this reason I have been looking for an original in Pristine shape, with not much success.
Your custom restorations look fantastic, if I ever run across the exacting original Lionel TC paint color, off the shelf, I will let you know. So far I have not been able to match it exactly. However you might be able to take a pristine original Terra Cotta Lionel 810 into your local NAPA store, and have them mix some matching custom paint, in a spray can for you. I have been thinking about doing this myself.
I like custom Crane Cars a bunch!