The fireplace idea sounds really cool. Its kind of difficult to picture what you guys had in mind from the plan drawing you posted since it was bird's eye view. But really considering the design choices you've made so far., its clear you guys are batting 1000, and there's no sign of that average being in danger Whatever you've picked is going to be fantastic.
By the way - do I recall you guys having an exit from the bedroom to your pool area? If I lived in your house I have a horrible feeling I'd forget what the rest of it looked like. I'd get up, look outside, wander out there 'to check on the pool' and suddenly its evening....I'd have to get Jammies I could swim in...LOL.
EDIT: OK, I just went back and re-looked at your plan. Realized the landscaping was all on there too. HOLY HECK!!!!! You better be posting us pictures all through the landscaping too. Your backyard is going to be off the charts when it is done. Like featured on Houzz-worthy.