I know we're closing in on Halloween, but last time I checked, house framing doesn't float in the air above the foundation wall like Casper the Ghost. There's a reason inspectors need to physically enter the crawlspace.. Here, the floor joists are a half-inch from the sill plate and there's also a gap below the sill plate (and no anchor bolts to be found!) Add to it cracks in the wall an inch or more wide with substantial deflection, and yep, I punted. This is one for a structural engineer like Evan Laubach of Pullman. He's terrific at finding solutions to major issues, usually in a cost-effective manner.