Such an amazing build - and built from two cars most people would have scrapped - from rags to riches!
We offer pretty much EVERYTHING for the classic mustangs, from floor to celling.
So I'm sure you'll be able to find something to put this towards! - (My vote would be our molded Fiberglass one piece headliner for the fastbacks - clean, easy to install, and adds 1.5inches of headroom.)