If you do things your way, you are looking for you as a buyer, which can work, but oftentimes people with artisan taste or over-reaching artistic vision customize the house too much for your market buyer and in turn, overprice it because they put their heart and money (and often too many upgrades) into it.

We’ll buy the stone by the slab and then we’ll have a fabricator custom-cut and install the countertops.

I plan to live in this unit for at least the next 4-5 years and ideally would like to hold on to it as a rental property when I eventually move out. 

If you find a real estate attorney, they would likely have some forms available that they have previously analyzed and used for a different matter and can customize it to fit your needs.

It's possible for your "dream home" to also be a good investment and I think that should be the ideal goal. 

I came across the BRR method and have been watching videos/ reading about it, it seems very practical and like the ideal way to invest.

My mom is getting older and a two-story home is less than ideal.

If I can get closer to late q1 in 2021 that would be ideal. 

Ideally they will leave on their own accord. 

Build trust among audience by having an official website and a customized brand image, you may take inspirations from real estate logos and websites to structure your plan towards strong branding.