Custom number ("Tape measure" )format for Excel 2003

I want to use Excel 2003 to draft up a preliminary floor plan for a room. I want to add dimensions on the
length and width of the perimeter of the layout such that the numbers are displayed as follows (in inches):
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 1.10, 1.11, 2.0, 2.1, 2.2.......3.0...etc

As you can see, for every 12 inches,  the number resets back to the next whole one foot measurement.

I need to be able to enter the first number, and then have the capability to click and drag the numbers across the screen so that excel will automatically fill the numbers in this format for me.

thanks