It sounds like you’ve got a solid foundation with your contracting business.

Running a syndication is certainly more work, different types of work, different personal and professional risks.But beyond those risks, your investors are your bosses.  

@Kyler Cook I believe you already have your answer, tithing on your gross.

I watched my parents flip houses since I was little and have always been on job sites or made "pocket money" by doing chores like painting fences or washing kitchen cabinets, which I realize now my parents were putting us to work to build that sweat equity.

Worse case scenario you distribute from your Roth early and pay taxes and a 10% penalty.

PLEASE do your due diligence when inspecting foundations on your future homes, especially in wet climates.

The goal is to get my own GC license but in AZ you need 4 years of experience (hands on or managerial) to even apply.

If stability is more your style, the home equity loan covers you.

This particular tract of land is a fairly rectangular 7 acres (400'x700', more than needed) and is owned by someone who stopped using it prob 10 years ago.

Now, I’m assuming you have an acquisition agent who knows their stuff and that your closing ratio is decent.