I am a contractor so this house is an attractive deal for me as the circumstances can work. 

I have hired leasing agents, lawn care, cleaning and web/graphics design.

You also, in general, get a different type of tenant for a 6 plex/apartment vs. single family house.A single family house will attract families, multi generational families, boy friend/girl friend with his, hers, and/or theirs kids for the most part.Apartments attract single people, recent divorcees, starting out couples, students. 

Having the GC license, the real estate license, being able to do all the designs in-house, and being able to manage the project directly.

or single family)- close monitoring of initial investment, minimal money down2) BRRRR in Denver area if feasible, considering out of state- Focus right now is getting pre-approved for FHA financed property and close on an attractive deal.

Since then, I've been doing a lot of reading/research and I'm attracted by the opportunities that real estate offers.

We’re trying to design a fair compensation package that aligns his interests with ours and makes it sustainable for him in the long run to continue to manage a growing portfolio.Does anyone have any suggestions regarding the best way to design such a package?

Yuba city is attractive for cash flow.  

Do you hire a designer?

The only thing I'd worry about is that could make your offer less attractive in a multiple offer situation.