If MFH is not allowed, see what the zoning permits for accessory buildings, mother-in-law suites, etc..anything else that could get you more income.Follow what @Greg Dickerson said to figure out what you can afford.

Even a google search shows that the non slip material is an accessory and purchase and added onto a bath tub but they do not come from manufacturer with it.  

It's no secret that one of the biggest obstacles to building Accessory Dwelling Units can be financing.

Ex: “all smoking/ vaping needs to be done off the property.

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I also placed a second Internet order for accessories, also in stock.

Typically, what you are calling a "workshop / liveable space" is known as an accessory unit.

I have already built a smaller accessory unit on the property.  

When you say "DADU", we're talking about a dethatched accessory dwelling on the same lot as an existing single family home.

Instead of saying why things won't work for you, try to brainstorm ways you could make them work, even if it's just an intellectual exercise.If renting rooms isn't a good fit since you're a family man, how about buying a single family home with an accessory dwelling?