In fact they should encourage it and stand by that property. 

Don't go for the custom turtle or whale tiles in the shower that you love that might strike someone else as cheesy.

For example, if you were building a custom home for $100/sqft 5 years ago, what might that look like for you today?

I found out by calling their business customer service and getting the skinny from reps.

I would encourage you to ask questions, schedule meet ups and dive into the podcasts and blog post.

In my version of all this, I like to land on a rehab once I already have a buyer picked out an prequalified and I know where they want to buy and I can walk a deal I have under contract and do a scope of work and upsell the cabinets,floors etc (manage costs) and the potential buyer is excited about moving into a customized new home instead of a used home. 

Also, although I encourage you to think critically and strategically about renting out your empties, I also don’t want to fully discourage you from using traditional newspaper and online marketing.

Tiny homes can cost more than average size homes after customizations.

I intend to print before/after pics and put together a whole "appraisal packet" to encourage a nice number.

Seek out the ones offering the support or lack of it that you're looking for, commission splits and fees will be based on what you want and some brokers will even customize a program to what you want.