I currently have a SFR on a corner commercial lot that allows for up to a 1500 SF garage. My thoughts are putting up a 48' x 30' garage (4 - 12' x 30' stalls). The garage can be built for approximately $21,000 (DIY ...

I have been a self-employed sheet metal shaper/coachbuilder since 2004.

I know that the coil is cheaper.

If not really in good shape, then they go into the dumpster, or I find a scrap metal hauler to take them (again, only if they take it for free).

One night some drunk missed the turn and plowed into the house, killing my friend while he slept.The city installed a heavy metal barrier in front of the house to prevent future occurrences.

I have rented to some people who met all the criteria you'd think would guarantee a good tenant, but who turned out to be miserable in other ways; one was picky beyond belief, another constantly threw loud parties, etc. etc.

@Bob BastingFollowing are the similarities and differences between the solo 401k and the self-directed IRA.The Self-Directed IRA and Solo 401k Similarities Both were created by congress for individuals to save for retirement;Both may be invested in alternative investments such as real estate, precious metals tax liens, promissory notes, private company shares, and stocks and mutual funds, to name a few;Both allow for Roth contributions;Both are subject to prohibited transaction rules;Both are subject to federal taxes at time of distribution;Both allow for checkbook control for placing alternative investments;Both may be invested in annuities;Both are protected from creditors;Both allow for nondeductible contributions;Both are prohibited from investing in assets listed under I.R.C. 408(m); andNeither may be invested in your own business. 

You are correct that it is not allowed.In some older homes there is sometimes metal conduit can actually act as a grounding conductor the entire system.

I am not looking to be Trump and I have for the most part met all my lifetime financial goals so I honestly dont feel the need to have any more rentals other than if they drop into my lap.

Should I go for metal or fiberglass?