General :: Track Locations On A Grid?

I am writing a database to track our (and others) wine collections. i'm wanting to track what bottle is where. so i can look up what i have, look up where i have put it and away i go to get it, simple right?

just to complicate things i want a system in place. where the end user and use forms to add/remove or modify wine racks.

assuming that all racks are rectangular i would like to be able to add a rack and call it rack 1. rack 1 has 4 shelves all able to hold 5 bottles. the database would then say that bottle X is in rack 1 shelf 1 position 1.

if possible there will aslo be a screen that is auto generated by the database showing a simple grid with grrn and red squares denoting if the position if full or empty. the ability to click on a position to see what is in there or to add a bottle there would be amasing but not fussed if that can't be done.