as for strings:
I'd be curious as to the neck you are using may not accomodate the spacing and the tension.
The nut will have to be cut and spaced - so buy a few nuts in case you mess up the first one.
My 8 is based on medium 5 string width neck
I don't like how "the system" uses the winding posts as double duty - I'd have to examine it closer.
It seems to be based on the Kramer system with tuning pegs off the back of the bridge plate.
Kramer at least had string mounts in the headstock for the octave courses.
I'm no expert but my gut tells me this may be a PITA to keep in tune or set-up. I may be wrong...
good luck with it and keep the forum posted.