That Utube is of Mac Hodges' B-29. I've watched his display many times; even saw the B-29 cartwheel in when a wing became separated! Needless to say, they don't fly well when that happens!
Any way, his website is:

http://www.hodgeshobbies.com/

He would be delighted to tell you all you want to know about that X-1; he's built a bunch of 'em. He's located in southern Georgia.
Good luck and keep us informed!
Allen