Some day I will develop and exchange the investment for the land but in the meantime I'm non-accredited and looking to invest in crowdfunding in the meantime. 

If all you ever want is cashflow, then owning fewer properties with less debt (also known as leveraged) will be ideal. 

Ideally, I'd like to build the 4-plexes in order to live in one and rent the other 3., but as someone with zero experience, would the single family lot be my best bet?

These properties need work and are ideal for flips.

There is an old saying in real estate, "find a great deal and the money will come," but this is ONLY true if you have dug your well before you need the water.My advice to you, if you are serious about syndicating deals, is to first figure out the kind of deals you want to buy and develop an "investment thesis" - what you want to buy, where you want to buy it, and why you think this makes sense.  

My husband and I deal with this on a daily basis.

I'm not entirely sure the product continues to be developed given their asset tracking still says "coming in 2017" but the site continues to operate so I'm going to reach out to the company to see where things are at and whether there's legitimate concern over the product shutting down. 

Ideally, we could find a brick industrial type building where we could rent the ground level commercially for about the PITI, and live close to rent free above in a loft like space.

I think my ultimate goal would be to own apartment buildings and maybe get into development.

Ideally someone independent and well-connected.