I really want to get into building a pump, I just can't see paying so much for one and not knowing the process that goes into building one. I've read forums for hundreds of hours but the next step is to experiment on my own. I'm interested in making a test bench and all the necessary equipment, I do have a small machine shop as well. Would I be considered insane for even trying? I know the people who do experiment in this way are seriously dedicated and knowledgeable. I do have 2 good pumps and 4 cores though, and a cherry engine to test them on.