Revised Design shown in the quite hard to work with "2D Design Software"
Base size is now 65x65mm
The Middle Plate Is shown In 2 sections (Mill and Cut) because the mills can only really do one height at a time xD
Middle Fin is *rather* large but with the machines at school it is either there, or not. So I will be making a channel through the centre of it at home with my Dremel.
Extra detail will be added with my dremel too;to add turbulance and help combat laminar flow.
Each dot is 2.5mm away from its neighbour and is there for measuring purposes only.
At school now hence 800x600 and IE lol
Thanks for all the feedback.