But only the last of those links mentions placing a name, and here is what it says: "The mailbox may bear the owner

Bear in mind that these are business/personal credit cards and I made him explain to me how they'd help me pull cash with no fees.

Same goes for number of LLCs and what to fund them with, since bear in mind that CA tends to be more cumbersome and expensive to have LLCs than other states.California is generally more cumbersome than other states when it comes to taxes and filings.

Again, please read thoroughly the statutes, they should outline if you must or not keep separate, of course interest or non interest bearing, etc… As long as it does not specify “where” you keep the account, you should be able to put that in your brokerage account.Here in Florida, we can’t commingle accounts and must reconcile each month.

They cost what the market will bear.

MAKING SURE THE SOIL IS TESTED TO MAKE SURE IT CAN STAND THE PRESSURE I ASSUME, LAYING THE SLAB OF CONCRETE KEEPING IN MIND OF UTILITIES AND ETC.

Taking some of that space for the bedroom would only require framing in a non-load-bearing wall, closet, and bedroom door, plus adding a few electrical outlets/switches, and then finishing with insulation, drywall, paint, and trim. 

All of that concrete rubbish has to be hauled away and new soil brought in.

Door count has no bearing on the cost, value, or cash flow of an asset.

If you feel any pressure, ask them to bear it themselves or keep the trim.One of the most important lessons you'll learn in life is resisting the fear of missing out and the pressure to say no to things just cause of the environment you're surrounded in.