Currently I am still working on making a mould from a really good original dash that I picked up in England. The dashes when done will be made from polyurethane resins and foam. They will have the same foam pad thickness as original and also have the speaker grill although the holes do not go through the dash. It's only an impression to look the part. They could be drilled through though.
There is another thread here http://www.thesamba.com/vw/forum/viewtopic.php?t=475227
This pic is the original dash that mould is being taken from, the silicone surface of the mould will capture every detail of the original dash.

