I haven’t personally heard of anyone going the SB1079 route, but I have done some research on it.

Most propane suppliers will offer a discount if you purchase your own tanks outright, I save around $1.00 per gallon.

Tell me - someone selling their home to your son, Subject-To - is this a person who has made good life choices? 

Real estate investing is forgiving; the average person can still make money even with some big mistakes.

We had to save up the 5% to get our first place with an 80/15 first and second mortgage.  

Other then that you can sit tight and let your primary appreciate, save more and explore pulling a HELOC to tap into it.

@Mark Towey I don't "farm" areas personally, it doesn't really fit the niche I'm personally going after, but what I have heard from some major agents in my market lately is that farming is not near as productive as it used to. 

Buying existing plans and tweaking them through an architect could save time and money compared to a fully custom design.

Do you all have any in-person meet ups?

I'm willing to help this person in any way I can.