We recently returned from New Mexico where we were looking for a possible site to build. In the course of speaking with builders who (all of which build custom homes) it was mentioned that a recent home was built with all the kitchen cabinet working area was lowered to wheelchair access hight. the upper storage area built normally was incorporated within the design of the kitchen/dinnette area on lower levels but not seemingly out of place the area under the kitchen and bathroom sinks were constructed so that there was "drive in" area for the wheelchair. The piping was adjusted accordingly so as not to be readily seen. All pantry draws were on slides. In New Mexico, the floors are mostly mosaic or ceramic tiles. There is a way to lay them so that there is a smooth surface rather than 1/4" wide with grout. This makes for smoother riding. (While laying tile) you might consider a point spoken over and over again here about a checkerboard effect about 18" tiles to fake the visual system and make it easier to step easier (if thats as problem) Of course, ramps wherever possible and 36" doorframes. There are many articles now threading here with many many ideas. Good luck Joyce