If I'd do my build again, I'd probably go with a 4-way switch like I did my last build the "Hemi" or "Ol dirty basstard". I did it with a 4-way Grigsby and one humbucker + single coil. Neck, series, parallel and bridge. This is an easy way to do it.
With a preamp you can't use the blend seamlessly with it. What I can tell now the series option boosts the pickups tremendously with the passive option so you get way louder pups if you skip the parallel option. Then again with the preamp you get same kind of effect although the basic sound of the pickups are different in parallel.
For what it's worth I like the sound of chinese pups on mine very much. Paid about 13 AUD each so for the price they rock. And Weirdbits is the voice you should listen on these things. I'll keep an eye on this build. Have fun. The Artec is well worth the money.