[joebog1]

I use cheap self adhesive plastic film AKA book covers.
Its available in about 100 different colours, but clear or white works best.
You might know it as "stick on veneer" thats used on cheap cornflake constructed speaker boxes.

Stick it on, draw your measurements/holes/cuts, then drill and cut as required, when you have finished peel it off!! Costs about 10 bucks for 5 metres X 300 mm.

Joe