Haha I'm really looking forward to this one as well but it will be a slow build, because of all the work involved and that I want a really nice finish because the parts won't be cheap.
I'm investigated tailpiece and bridge options. At this stage I'm looking at a 12 string harp tailpiece. Bridge will probably be a genuine 12 saddle Rick bridge.
Tuners I need to look at what options there are because the Schallers are pretty pricey and obviously I need 12 of them.
For the pickups I've been unable to source 0.25" Alnico 2 Rod Magnets so I'll probably order some Alnico 5s and depending on availability and cost I may use 43AWG wire instead of 44AWG.