thanks for the info bladrunner.
i use the acrylic because it's easy to work with I found a picture frame at ikea thats 2 pieces of acrylic one about 2mm and one about 10mm for only £8. This means i can buy enough to do what i want without spending a small fortune.
i have made a wb from it that works very well in testing.
my block thread
Is there a easy / cheap way to water cool gf4 memory ? i was thinking of using some square copper pipe cut to an L shape but think the 90 degree angle will stop water flow.
again thanks for the info.
Lee