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This detail puts torsion into the perimeter beam and does not resolve it.

Interesting. In the past I've used the values for 2"-4". Table 4E gives values for visually graded decking. Doing a spot check the Fb for decking is around twice what they give you for 2"-4".

The NDS supplement has info for allowable stress of the species and section properties of the board size.

The Terry Malone book goes through some pretty thorough design examples.

My vote is for steel frames. Creating the formwork for something like this seems like it would be a nightmare.

In my experience there was a physicist on the design team that lead the shielding requirements. The wall thickness ended up being around 7' thick.

It's web based now. You have to make a profile but the software is still free

Hilti has a free program, PROFIS, that does anchor bolt design. Playing with that can give you a feel for what needs to be checked and what bolts are applicable where

If the hole size voids the allowable dimensions I would give a repair. Depending on the actual hole size the plumber needs, you could look at TJI's TB-187 for a repair detail. If you reach out to Anthony they may have a recommendation.

Simpson makes compression straps and stud shoes that could help you out too.

I think what RWW0002 describes is what the author does. He gets the soil pressure with the thrust force in the "Proportion the Foundation" section then uses that to design the base.

This might be better served in the general discussion. I would try to go into the store below and look up through the ceiling at the joists to get a better idea of what is going on.

Use wood. There's a bunch of how to videos on this now

Might want to think about an impact load unless you plan on setting it gently each set.

Version 15 of the AISC design examples has something relatively similar in the composite members section that might give you an idea of how to look at it.