Beautiful design. Very classic.
These are just some random thoughts I'll toss out there. I'm sure you've put a lot of thought into this given the design posted, so my intent is not to step on any of your ideas. Just to provide some talking points.
I am intrigued in particular by the outdoor radiant heating. I've never heard of its use outside for anything other than keeping ice/snow melted off of surfaces. I am curious how this would all work. My understanding is that it needs to run for long periods of time to be effective and that your benefit from it is really most in enclosed spaces because you ultimately are heating the air as well once the slab is up to temp so you end up with everything being a consistent temperature. Any thoughts on overhead radiant heating units?
This also looks like the perfect project to install retractable screens for bug and or sun protection.
If it's an option, I would run gas to the fireplace so you have a starter pipe. No messing with kindling if you are going to burn wood. Just throw three logs on and light the pipe and let it go for a while until it's got a good burn going. Leaves the possibility to also just go straight gas if the wood ever gets to be a hassle.
I see two fridges. Have you considered a guest facing fridge for beverage self service? Very convenient when you are focused on cooking so you don't have to keep grabbing a beer and it will keep people out of your way.
Is the dishwasher for dedicated outdoor plates and serveware? I see the shelves/pantry area so I am guessing yes. I assume that will be a well sealed door with weather stripping to keep bugs/dust out.
Any ceiling fans in the design? I am going to guess yes, I just didn't see them referenced. This is the perfect space for these:
http://www.fanimation.com/products/palmetto
It's so easy to spend other people's money LOL.
Anyway, like I said the design sketches and the plan look great and well thought out. Please post pics of it!!!!
-plat