lots of Q'z
something practical, buying copper in thicknesses above 10mm is gonna cost ya (pay per kg).
if one half would be plexi, then the other half could very well b 10mm. that would mean that with a BP thickness of 2mm, u'd still have 8mm left for the water. that should be pretty ideal (water velocity over flow).
- 8mm from bottom cavity to start point of plexy will be enough
- the top should be thick enough to safely thread in the barbs, i have no experience making threads in plexi.
- the blocks i have made have always been dual outlets. does it make a difference ...? not if u r not a freak of flow resistance. 2 outlets will certainly reduce flow resistance of your block, but if u use 3 90°z in your tubing setup then i guess it won't make too much of a difference.
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