We'll both be involved hands-on with the renovation work, and we're 50/50 on the net profit, so how is the profit split when it's time to sell the house (other than I totally trust him)? 

I understand how important it is to expand your presence in the online marketplace to reach a wider audience.Given the complexity and technical aspects of e-commerce, I would advise you to seriously consider enlisting the help of a professional e-commerce development company.

My 3 SFRs avg real numbers: I get $1075, 871 and 617 each door for a total of $2563 on those doors.  

Hey Enos, totally can relate with you being from an expensive real estate market - I moved to Columbus a few years ago (from Portland, Oregon which was super expensive) to become a full time real estate investor, and ever since, I've completed quite a lot of BRRRRs, flips, and own a successful rental portfolio here in Columbus Ohio.

I want both units delivered vacant as both units are a total mess and need a complete overhaul (new flooring, new bathrooms, kitchen, adding a washer/dryer/ etc).

I used to be a part time web developer and I know for a fact that a single like from an ad you posted online automatically becomes a lead. 

Let me guess your "team" doesn't actually own any investment real estate and you learned about investing off an online guru?

Looking at the underwriting rules for FHA and CONV investors can only own a certain percentage of the total # of units in order to be eligible for this type of financing.

Totally allowed in zoning, however selling it separately will be next to impossible as there is a minimum lot size, so you will not be able to split the dirt.  

That's total project cost of 425k.