In my area, we've had a couple of very severe nit pickers (one got rejected for peeling paint on a metal clothes line) and others frankly give anything the thumbs up.

I know mine went down one year when I got an exclusion for a metal roof but my payments never changed. 

Probably $4-4.5 or so for everything with metal wrap.

Going back to the question, it is basically a foundation and structural upgrade work, each contractor AND engineer will approach it differently, some will use metal instead of wood (my preference), some will dig deeper foundations while some wider.

We were able to create 3/8"th metal shims for the installs after like, the 7th one. lots of trial and error

@Daniel Sanniti between the feasibility study (will give you an idea of what’s renting in your local market), the metal/door supplier (a company like trachte building system) and your vision of what the building should look like (might need an architect for that) you can get a estimate of what your unit mix should look like for best profitability on your investment.

You'll love the style of this house with its front wrap around porch, stained support pillars, black metal awning and so much charm you'll bust!

You can look around and see, every old wall with metal posts is bent over.

They don't have the metal for it.  

After splurging on podcasts, webinars, youtube videos, and across the forums I'm looking forward to putting the pedal to the metal on my investing career.