Seems like you have a nice project on your hands!
I have never considered a dump bucket due to my lack of experience and skill working with them. I also have good experience with closed loops so i decided to stick with what I am familiar with.
The aquascaping did not come out as I had hoped, but nonetheless came out pretty good. I was going for three islands with the center island being connected to the island on the right (which it is), but the spacing came out too close together and now with the coral growth you cannot really tell their are those islands.
My plumbing came out okay but is not the neatest job in the world, but that is ok because all of this mess is in the garage and you cannot see or notice it from the room viewing the tank. The only think I would change is to perhaps put a pully system on the canopy so I can get into the back of the aquarium from the front a bit easier. Now I need to scrunch in between the canopy and the tank. Luckily I am not a big guy or I would be screwed. I would also make my overflows a little smaller than they actually are today. They take up quite a bit pf space.
Filtration is traditional Berlin style. Live rock, (live sand) DSB in refugium, big skimmer and that is about it.
Good luck. Be sure to post pics when the project is complete ar progress pics to ssee the development of your chemistry project!