If you are looking to make some money and have a place to use 4-5 times a year, then from that aspect it's a great investment but solely looking at numbers I could find others that perform much better.  

We're def in a down market...we always are during the holidays but we can never truly predict it.

The appealing aspect here is the ongoing population growth and other economic factors.

when partnering with people on a Joint Venture deal make sure to thoroughly layout all aspects of the companies operations and ensure that a clear understanding is made as to who will oversee what. taking the time to find the right partners can go a long way when the going gets tough or feelings get hurt. initially the deal involved partnering with a hands off venture capitol group but luckily an owner of a nearby carwash offered to go in on the deal instead and provided his industry expertiseDid you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

.- Be Clear: Define all terms clearly in the agreement.Mistakes to Avoid:- Incomplete Due Diligence: Conduct thorough inspections and financial analysis.- Unclear Documentation: Ensure agreements are well-drafted to prevent misunderstandings.- Market Trends: Consider future market impacts on property value and income potential. 

Check your contract and make sure there was a defined process for change orders.

Companies expand to locations with low crime, low operating costs, a pro-business environment, and a metro population >1M.Having defined these three requirements, I will now provide the sources for the necessary information.Cities with a metro population >1M: Small towns may rely too much on a single business or market segment.

This will be one of the smallest ADU additions.However if you are adding it to be used by family/friends then the investment aspect is not as important.  

Is there more reading material regarding this aspect ?

I'm focused on buy & hold, but open to other aspects as opportunities are found.