building unique airbnb cabin. Strategies to get appraised?

[Jae Jun]

I'm building in a very rural part of TN (Altamont). 

There are unique structures around me within 15 miles and wondering what strategies can be used to help get unique properties appraised so I can refinance out?

Is the only option to find someone who has appraised unique structures before?

Or end up paying everything with cash?

I've finished clearing, driveways, gravel on a piece of property in Grundy County, TN.

Money has been spent for the horizontal build so far.

I'm not doing a geodome or tent. But actual framed structure, high end architectural aspects that is uncommon for the area. See rendering below.

[John Underwood]

Consult an appraiser in your area and ask what features appraise the highest. 

They can give you an appraisal based on sq feet and finishes for a neighborhood. 

Then I get an actual appraisal after its done and leave a copy on the kitchen island for the bank appraiser to see.