And if still in Spain, how long until it's in US and is shipping additional or is price landed? 

Feedback has not suggested property needs additional repairs/work, only that they are looking in a different area.

This doesn't replace the need for a MSA that will capture additional clauses needed on a Contractor-SubContractor relationship, this is just a project specific form you would use in addition to the MSA (prepared by your Attorney):This template is for informational purposes only and does not constitute legal advice.

I should add it will be a short term rental property. 

If you’re comfortable with a bigger investment, a duplex is good for the benefit of additional cash flow and you could house-hack.

Some carriers won't allow insured to be a trust, so in that case do it in your company name with trust as additional insured.

@Cole DobbsIn addition, I may be able to help you and connect you with some key real estate investor players in the Houston, Texas market since I am an Investor myself that have done most of these real estate investing strategies and also an investor-broker who has helped over 400 investors like you. 

If we sense there is a red flag, were asking them to upload additional documents like tax returns w2's etc.

In most single family zoned areas adding a single ADU is not a value add meaning it will not add more value than the hands off cost of the addition.  

With the economy of scale in multifamily, each additional unit nets you a little more than the last, as a rule of thumb.