Tax free if your primary residence 2 out of 5 years.  

My primary property is a 3/2 1266 SF home on a 7500 lot.

Seems like if you pull out 35k assuming you can get a similar 7.5-8% interest rate (DSCR tend to be slightly higher than primary residence rates) you would be barely breaking even.

With your primary residence, however, that will matter with most programs (there are a handful of programs that might work to bleed equity out of a primary residence, but they are more pricey than conventional financing).  

Recently I've seen a massive increase of homeowners rolling up their sleeves and taking on DIY projects either on their primary homes or on their rental properties.

They have a good exchange rate and English is the primary language.

I’m the co-trustee of a family trust that holds a single family rental and my father’s primary.

This has me very interested in moving out of my primary residence and building a silo home or duplex on this property.  

So completely agree with the other advice you were given on that.I had the same issue with stagnant equity in my primary, but you have the regular options of doing a cashout refi or a HELOC to get at it.

The requirement to have a realtor license, according the Maryland state statute 17-102, does not apply when (among other things)"an owner or lessor of any real estate while managing, leasing or selling the real estate, unless the primary business of the owner or lessor is providing real estate brokerage services or...a person while acting in the capacity of a personal representative" Sounds like a carve out for representing yourself to me.Which would be consistent with the NC definition of a realtor as anyone who buys, sells, leases...real estate for others for compensation.