SureFoot
Thanks,

better milling equipment would be nice, but all I'm trying to prove is it doesn't require super expensive tooling or skills to produce stuff like this, Just some time effort and dedication.
morphling1
Most glues even epoxies are not recommended for continuous immersion. Also mixing metals especially aluminium and copper is bad if you want a water only system. If you are going to use epoxy maybe a thermal transfer type would be better like Artic Silver.