Hi....my husband has just done my new room for me... much smaller just 10 x 10 but all my space...We put a lot of thought to cupbaords, storage and the work surface. In the end we just laid the work surface on the cupboards and have it against the wall but should I need more space I can just take off the work surface and pull out the cupboards and then replace it and have a central island....that way I get the best of both worlds...we are debating wether to put the cupboards on lockable casters to make it even easier.
We took a trip round ikea for just to look at possible storage and ended up spending a small fortune !!
Good luck