A true Solo 401(k) lets you invest in multiple categories such as precious minerals, metals, and real estate.

The metal was probably 1/4 thick of the old one so that it felt like a toy; the sprayer pattern was cheaper (less jets and less pattern) and the button was worse.

New skirting for some homes...look into using metal roofing material. 

I then installed resilient channel, it's metal track that hangs off your ceiling joists and you screw the drywall to, this results in the drywall hanging off the joist, and significantly reduces the noise of things being dropped or banging on the floor above.

Not from Alabama (except for my ancestry) but we found a great deal on a house with a metal roof in a great area in demand. 

For example, you could have a metal roof, if it gets dented its still OK and will not leak.  

Not an issue unless it's still usedOdd size windows, means custom window replacement Clay tile sewer lines could have been used, cracked, damaged lines can leakLead pipe water supply lines, won't kill you, I used them ever sinceWiring may not be three prong grounded lines, check behind the outlets.Fuse boxes were used then, not breakers as today, but that may have been changed out, 60/80 amp service lines were common, utility company may have updated to 120 amp, in the 60's, may not be sufficient today so see if the service line in is 200 amp.Electrical boxes can be smaller and metal, light switches and ceiling boxes, won't hang just any new ceiling fan from just any old boxes.Check the bathroom electrical outlets near sinks and tubs, make sure they are grounded properly.Old floor registers for return air and ducts, these could be abandon when upgraded and covered with carpet.

What about the AC handler/coils?

watch the moving Tin man  this is the old metal siding sales schemes. 

If it's a metal geodesic dome and your main house is an English cottage it's going to bring value down.