Also the last stage, from 43 min on is all subsonic.
Also the temp inside is a balmy 80-90 F, and you say outside is 4000 F? Dont see any air coniditioning ;)
I would need some of these heat shields myself. Where can I buy them? Amazon? It is only 100 F outside here. It should not be a problem, considering they work so well at 2000-4000 F /s