A bit of a late reply on this, but I'm now in the process of building my MO-RA 420. I'm now in a similar position to yourself regarding power, as I'm going to be running two D5 pumps & a Splitty 9 active, so will need 3 sata power. I don't suppose you could tell me what 3 sata to molex you used to power it all? I'm hearing horror stories of them potentially catching fire, so thought I'd ask you as I know you've done it this way. Build looks awesome btw - hope it's all running well!
Having run this for a year now, I have noticed an issue running the whole lot of 1 molex cable. It hasnt catched on fire, but the D5 pump on the MO-RA is not longer working. Im not sure if thats due to a faulty pump, or too much power going through 1 molex. Either way, I plan to run a second cable to power the pump independently. 1 Molex is running the 16 fans fine however.