mementh, I finally finished watching your video, and I can't imagine myself building such a complicated setup for around 802 EU/t - now that you've corrected the formula in the google spreadsheet, building that reactor takes about 4.76 times as much lead as an EU-style reactor, but produces less than double the output of a good EU-style reactor. The 420 EU/t design might take more uranium, but by the time you have enough lead to make 343 ingots of it, there's a good chance you'd also have enough uranium for 2 or even 3 such reactors.
Edit: I also have some suggestions that might help you shorten your video a bit, though probably not down to the suggested 15 minutes:
1. Use a superflat world. That way you don't have to spend time clearing away plants or putting in extra dirt to allow yourself to walk around the reactor. If you're concerned about being able to get under the reactor to direct some of the fluid exchangers up, you could lay down a few extra layers of dirt ahead of time with plenty of room around the reactor, or you could see if your design would work with the side assemblies rotated 90 degrees so that the fluid exchangers wouldn't need to point up.
2. Cut the sequences where you're just building an identical structure on a different side of the reactor - you can just say you've done so.