This is really looking fantastic. I'm eagerly following this keeping a little log of what I'm going to do on my next build!
FWIW, I have never been happy with the noise level of my Reeflo pump. I've got the dart, and from day one it sounded like someone was using a hair dryer in the next room. I got replacement bearings from Reeflo and swapped them out myself, but it didn't help at all. Shortly there after the seal went (why, oh why can't they make the metal components on pump seals out of stainless?) and it started to leak, so I ordered new seals from Reeflo, but this time I went with my dad to one of the high end transmission/bearing places and bought the highest end bearings of that size that they sold. The pump is still louder than I think it should be, but it's reduced to more of a hum that fades in to the background as compared to the high pitch whine that made it hard to talk on the phone in the office before.
I don't think the bearings that come with the pump, or that Reeflo will send you as a replacement are necessarily the greatest quality. If you can't solve the noise issue any other way, I would try sourcing your own, much higher quality bearings and see if that helps. I'm not sure about your model of pump, but the swap on the dart was relatively painless to do, you just need a bearing puller (super cheap) and the right deep socket to help tap the new bearings in place. I found a photo tutorial online showing exactly how to take the dart apart and do the swap.
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