As per my personal experience the biggest pain is time and resources management, for example internet connectivity meetings in between of journey. You can feel free to call me for more detailed answers.
I actually just came across this article from Real Estate Crowdfunding Platform Patch of Land about how tiny homes are going to be very innovative and popular: https://patchofland.com/blog/growing-communities/2015/01/28/innovation-online-residential-real-estate-investing-patch-of-land/. In terms...