I will note, whether it be stainless or some form of matte color, a smooth exterior will show a lot more wear than the traditional textured exteriors.  

I have talked to 20 plus investors in the last week considering switching from traditional tenants to section 8.

Additionally, can you eventually do a BRRRR refinance with a traditional mortgage?

I say this to illustrate a point which is you are looking for unicorns or the property is not marketable in a traditional transaction (could be location, condition, price etc.) and therefore the seller has to offer creative financing as a concession to off load a bad asset.

@Sean Gribbons we completed a condo conversion and you are correct, the unit sales could not be traditionally financed until the very end of our project.

Many duplexes built around here are traditional up/down stick frame duplexes sided with either wood. vinyl or aluminum.

However, be mindful of the higher interest rates and fees associated with hard money loans compared to traditional financing.

Most areas are seller-friendly now so even if you can't make it assumable, what's the issue with a traditional sale?

That will allow you to refinance into a DSCR loan or more traditional financing 

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