just had a walk around the scap yard close to my place where i get my heater cores from and they told me there is a copermine .
just down the road but they wont sell me anything
anyway one of the scrap yards told me of a non ferrous metal dealer on the other side of town. I will be going to see him in the morning. If i cant find aything then i will use the other thermaltake base.
i got the 2mm brass tubes from B&Q depot without the tubes the 2mm holes in the polycarb dont make very good jets but with them awsome.
the polycarb is very easy to drill with small drill bits and i just made some tests on some copper i cut of the thermaltake base and i am confident as long as it's punch correctly that i can make a good job if it.
Plus i just spent £5 on a 3.5mm drill bit so it's nice and sharp.
my plan is to screw the poly top to the copper and then drill the 2mm holes into the poly just making a mark into the copper.
then punch the mark and drill the base.
the only weak point is how to glue the tubes super glue works very well but how will it hold up to the water is the question.
the tubes fit into the 2mm holes in the poly carb very well and actually stay in place with no glue.
my design will have 3.5mm holes in the base plate 1mm apart with the 2mm tubes. I know it wont work as well as cathars design but then this is a diy attemp.
i think that answerd all your questions and thanks for all the tips.