Check this homemade WB out

[JASSAF]

Its a good idea.... but the design isnt the best one:

1- it is a block with a lot of mass (I disagree with NaeKuh)
2- the 3 plates (base, top, fin) mess up the convection of heat
3- when welding plates of the fin to the top it may have not enough contact with the whole surface
4. fins way too thick and too close to each other

What you can do is (chek design):
1- craft a high performance base: no more than 5°C compared with EK Supreme HF
2- fins and top just 1 plate
3- thin fins and with more space between them
4- use copper tube as shown in the desing to place the fitting inlet and outlet.




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