In that case, it will be quite easy - go for single sided board.
First you need to figure out the exact dimensions of the board to fit the enclosure.
Once you have that I can draw you the board in Eagle and walk you thru the process of making it...
You will need access to a printer and some supplies depending on the method you want to try.
I recommend the photo transfer method.
You will need:
- Printer
- A few sheets of tracing paper
- Piece of single sided pcb with photoresist
- Piece of glass to hold the tracing paper with pcb pattern flat to the pcb during exposition
- Source of UV light
- Two flat plastic containers
- Plastic pliers to hold/move the pcb with
- Developer for the photoresist
- Ferric chloride
- acetone to clean the board
- small drill for any holes
- something to cut the pcb with (saw or score&snap off method)