In re-doing our kitchen, I mentally went thru the exact steps I take while preparing our favorite dishes/baked goods. I inventoried not only all the motions, but the utensils pots, pans etc I use. I got together my utensils, pans etc measured the smallest to largest to determine how much drawer/shelf space I'd require.
for us, the over the stove micro/fan is a waste. Very expensive & when the micro goes, so goes the fan. Having a DBIL as a long time electrical contractor he has some invaluable tips. Those units do die & are overly expensive. I do use a micro/convection & need to stir & look; so up so high is impractical. I chose a small (big enough to heat up a dinner size plate) microwave to place on the dining side of the kitchen, that way for a quick re-heat, folks are out of the kitchen. The workhorse unit is in the island, kitchen side.
I, too, wanted Wolf/Subzero appliances, but nixed the Wolf when 2 friends, both very excellent & experienced cooks had trouble with their new Wolf ranges, both within a year. Both women said the Wolf customer service was excellent, but why should this happen within a year's time? One lady required 2 housecalls, the other 3

They purchased the Wolfs a little less than 2 yrs ago. Go to a high end appliance shop, ask them re: repair rates. also, tmany of those places, usually, have a program where you can bring in your own pots, pans & food & try out the cooktops, ovens etc.
If you decide to go the designer route, find out if the designer is obligated to sell or design with certain applaince lines.
as for contractors, lots of recent references, check their insurances--available through the state--& check out if your insurance covers you if a worker should get hurt on site. Also, stipulate a completion date in contract, as well as a need for you to be informed of, in an itemized written list, any changes the contractor deems necessary & stipulate you must sign on such before any work is undertaken.
Another poster offered the very wise suggestion of checking out local cabinetmakers. Of course, this is all very local, but people would be surprised how very economical this can prove.
It's an exciting project, have fun!
Jean