But the cynical side of my brain knows the worst flippers out there will find a workaround for it and continue delivering low-quality flips to unsuspecting buyers. 

However, you should always budget for a worst-case scenario to maintain positive cash flow.Vacancy costsThe cost of vacancies can significantly impact your cash flow.

If I am constantly waiting to hear back from a tenant, I just assume worst case scenario and speed up the process.

I do not know the layout, but believe 5 units is the worst unit count.  

What’s your worst experience, and how did you handle it?

Links to your three other posts on this same topic so readers can see what's already been discussed:https://www.biggerpockets.com/forums/61/topics/551577-backyard-homes-produced-in-chinahttps://www.biggerpockets.com/forums/617/topics/551580-china-built-backyard-homes-socalhttps://www.biggerpockets.com/forums/61/topics/537480-tiny-homes-produced-in-chinaThis sort of house is an interest of mine, though I'm more interested in building them on-site with a 3D printer and local materials.  

If you have a contract with a listing agent, they are selling your house and you have no obligation to them if you go and buy a house unless you signed buyer agency agreement with them.Side note, anyone working for .5 percent isn't worth working with and you sound like the worst client for an agent in the world.

In the worst case, I may need to keep the property empty (while paying more than $4000 mortgage each month) until next Spring. 

I mean, they look sort of minor, but the problem is this person didn't learn the first time.

The worst.