Plus they are all busy doing occupant custom remodels.Flippers and landlords like me have alwyas been forced into being hands on, the crew chief, over handymen and a few licensed trades.   

As soon as you start discussing your business practice and strategies with your customers (tenants), then all bets are off and you run the risk of Fair Housing violations. 

The more you can GC and oversee the subs directly, the cheaper it will be.  

While I could sell both properties and turn a large profit, avoiding ongoing maintenance and property taxes, I’m also interested in holding on to both properties as long-term investments.I’ve thought about possibly doing a full demo and rebuilding a custom home in Carlsbad for personal use or to sell down the line for a significant profit.

This is assuming you are talking about a short term rental and not sub-leasing as a LTR.

They offer flexibility in design and can be customized to include a business space.Shipping container homes: While trendy, these can be challenging for mixed-use (residential/commercial) purposes due to zoning and building code issues in many areas.

Excellent customized spread sheet. 

A recent article in the Remodeling Magazine (a publication for professional contractors) made the case that if you don't mark up your subs by 40% you might loose money as a GC.

From your past posts, as well as what work you've mentioned being comfortable taking on yourself, I think you definitely have the requisite knowledge to act as your own GC and sub out any work you don't feel like taking on yourself. 

The software allows me to generate custom reports on my rental income, expenses, and overall performance.