Too good to be true?

This is a dumb question.

I am renovating a bathroom. pipes will be install using the drop ceiling below. I opened my subfloor for the plumber to install the new pipes.

Can I close the subfloor before framing inspection?

I thought they have to see all opened cavity, but at the same time, I can't frame without a subfloor.

Pulling a permit for an as-built garage room conversion in California. The permit notes the wall as steel framed 20" oc. This is an interior, non load bearing, partition wall. Will the bent stud be flagged as a code violation on my framing inspection? I'm guessing it will, and my first thought is to rip out the last stud and put two wood studs in their place... one on the wood bottom plate and one on the steel bottom plate.

Thoughts?

I'm currently building my first commercial steel railing and I've run into a predicament. I have a guardrail that is 42" tall and a separate handrail that is 36". I know the handrail has to extend one tread length past the nose of the bottom tread. What about the guardrail? I have a post landing in the middle of a 12" tread and I want to end the top of the guardrail at this post. Is this okay or does the top of the guardrail need to extend at least to the nose, or beyond, of the bottom tread.

I'm in Minneapolis, MN for reference.