I searched this topic and didn't find it anywhere, but has anyone considered using some kind of expansion bolt instead of an elevator bolt to attach the floor and C channel in a shell on floor replacement? I understand why you would need to remove the banana wraps and belly pan to access for elevator bolts but it seems like a blind anchor would facilitate a floor replacement with only access from the top. I don't have space for a shell off and would prefer to do most of of the insulation installation and frame painting from above for obvious reasons. I know Molly bolts are not super strong but there are lots of other blind fasteners that might work. I found these insanely expensive (like $10-$20 each) ones called box bolts that are used to join heavy steel plate. http://www.simplifiedbuilding.com/solutions/boxbolt/
I bet that these would work, but I can't afford them.
Hilti makes a variety of fasteners. http://www.us.hilti.com/holus/page/m...&nodeId=-60346
The aerospace industry has some larger rivet like items that might work. http://www.cherryaerospace.com/produ..._overview.html
These are made of aluminum and look very promising. http://www.afshuck.net/en/How_Huck_Works.html
I'd love to hear the opinion of the community about this. Has anybody tried something like this? What are the potential pitfalls and problems?