I have just a few comments/suggestions:
1. Floor tile- If the grouting in between the tile is too wide the wheels on the rolling chair stick in them.
2. If you want carpet, I would suggest carpet tiles. Rave Carpet(Its on line and very nice to work with even sends you free samples in your color choice) sells 18 inch squares. They sell "end of bolt" :) tiles for a steal. They sell left overs from business sales. It is low pile and comes in lots of colors. Dont glue the tiles on the floor, if you have a spill, you can just pull up that tile, wash it up in the sink, let it dry and put it back.
3. To save some $ on cabinets and the rest of the room too check to see if you have have a Habitat for Humanity Re-store near you. They sell extras left over from house builds dirt cheep. Some of the items I have seen at our local store are paint, tiles, flooring, cabinets, doors,nails, wallboard, electrical stuff, sinks, well every thing needed to build a house, and its all new.
4.I had a friend with a home built island in her garage. The ends were two old dressers with lockable wheels and she had three sheets of painted plywood stacked on top. In the empty space between the dressers she had saw horses. She used the small island as a cutting/work table. She would pull out the saw horses and slide the top boards off to make a large table for more people or to lay out a quilt to pin it. The saw horses were built up so the three table tops were the same height. It was so nice.