Below Deckstar Captain Sandy Yawn is facing a dire financial crisis after sinking $1.6 million into a Florida dream home three years ago that’s yet to be finished, RadarOnline.com has learned. Yawn confessed that she and her wife, Leah Shafer, emptied their life savings into building a custom home — only for the builder to jump ship, leaving them stranded without a place to live. It’s been a nightmare three years in the making for Yawn and Shafer. “It’s been horrible,” the Bravo star told the Post at the Miami Boat Show on Thursday. “We used all the money we had, and we still don’t have a home…