Jeff,
On my '94 the factory installed a fairly large piece of the galley faux teak board over the water tank under the aft dinette seat. I used that (cut to size) to create a door for the space where the fridge lived. It's a perfect match to the rest of the galley (since it is the same material).
For shelves, I just used plywood -- but it looks OK. The door looks great.
I store life vests on the water tank so there is no need to replace the board. But, I suppose any piece of finished plywood would work over the water tank if support were needed.
I'd give it a look -- assuming your setup is similar.
Matt