[Skulemate]

Are you going to try to reproduce the impellor housing in the copper block, or have I missed something? It could be tough to make the pump work as well if you are making your own, since they are specifically made to work with their impellor... I'd be interested in seeing before and after H-Q curves for this thing. Also, I think that the discharge needs to be more off centre from the impellor axis (just look at the housing that came with the pump... I think your goal should be to reproduce the inside of the original housing exactly, only in copper). Good luck with your build... seems like an interesting concept.