Don't split the work between multiple contractors if possible, finding one to do all or most of the work will keep prices down.Challenges were finding replacement pieces for certain items as manufactured homes were very different than stick built as well as going through state guidelines for affixing the house to the land

After this, we are hoping to pursue more destination-location STRs in Oregon and Washington, and possibly BRRRR LTRs closer to home to diversify a bit.Help me analyze this potential build.

Call every local investor agenda (look at the agents that have investment property listings and call them) and call every local landlord that owns multiple properties (you can get lists off of Deal Machine).

You'll want to enlist a CPA on this to assist you- Repeating the above for Cancun, since it's a vacation destination already, I'd almost guarantee you that you cannot write it off 100%In regards to travel, it's also important to remember that even if everything is used 100% for business, the IRS classifies business expenses being valid if they're "ordinary and necessary".

Would a bank even allow us to mortgage multiple buildings on a single lot without it being subdivided?

I think you should change PMs because you have multiple complaints.  

The calculator is a LIVE excel with multiple tabs and all of them are interconnected, you may mess up a formula and you will see awesome returns inaccurately.

You can have an email for each account and you should be able to set your phone up see multiple accounts at once should you get inquiries or messages.Just log into each account to make updates and price changes.

Ours are very simple boxes and we get economies of scale since we build multiple houses at once. hope that helps  

You didn’t mention the property or deal specifics, but for many deals in the recent years, there have been amazing and unusual gains due to multiple unnatural circumstances.