Mmmm....I dunno, man. The Spruce Goose never did any proof-of-concept troop hauling. It got up off the water, made some scary creaking noises and never left ground effect.
Power-to-weight, the thing is a 747-800. Size-wise, the thing is a 747-800 and a half. But there, where most planes have a fuselage, Stratolaunch has a stress concentrator. And it's carbon. Which means nondestructive testing is super-duper tricky and any delamination and it's done.
Rutan's a clever guy. But if you recall, the last big scary cargo beastie he built scraped its winglets off on takeoff and the closest he's ever gotten to a production aircraft is the Beechcraft Starship.
...and he retired in 2011 so this is his posse, not him.