U shaped is better than linear having had both. Just be sure backside of stove is outboard so the gimbals work!
We also like a front opening door on the fridge along with the top. It loses more cooling this way but lets you find your stuff and makes better use of the space. Our freezer is top only and this seems to work well. Make sure your builder plans for the best insulation possible if your headed south as this will save you more amps per day than anything else I can think of. If you are adding a microwave and mounting it in an enclosure...make sure you can easily replace it with a different size microwave when the first one fails and you no longer can get one of the same size! Also suggest insisting on 2 20lb propane lockers so you can simply swap cannisters anywhere rather than having to find a fill station. Deep sinks and one of those newer faucets with spray washer head are also nice. Also think about a water filter system at the sink for purifying drinking water from your tanks. Also...think about...how will you brew coffee/tea, toaster/toaster oven plans, spices/spice rack, dishes...since WHERE these things will go and how they will fare at 30 degrees of heel are also important in planning your galley. Where will fiddles and hand holds and safety strap attachments need to be? You will have a big boat with plenty of power I assume and the ability to plan things out that others must work around so you are right to try to think it all thorugh. Good luck!