I've attached a rough pic with measurements if anyone wants to build one.  It certainly fits my T2 playfield perfect.

As for materials they are as follows:

• 4 x Pine dressed DAR board 90mm x 19mm x 1.8m (cost of $18.72)
• 1 x Pine dressed DAR board 140mm x 19mm x 1.8m (cost of $7.56)
• 4 x angle bracket heavy duty carinya 100mm x 100mm x 40 Zinc (cost of $19.04)
• assorted screws

So for a total cost of $45.32 a handy jig to have....Thanks again to Nino for the ideas...