So i finally changed strings (along with pickups for MEC splits and preamp to darkglass tone capsule (tho i still hate darkglass as a company))I placed order for mine on 24th December, 4th Jan it came to my house (in Czechia)
Had ultra long scale elixirs on another bass and for whomever it may concern, they fit!
My illumina came with out of phase pickups but i talked to GOC and they will send me new set of pickups, afterwards I'll put on fresh set of elixirs and could take photos of nut/0 fret if anybody is interested in where winding ends
overall I am happy with bass, love the pickups (by themselves, cannot have both on at the same time), originally wanted to put in either Dingstrand Nordwalls (but they are from what i can find standard P and so that would mean that they will not be catching strings properly) or FD3n, but am scared to route for proprietary FD3n route and then find out that they won't fit
To fit MEC's i had to drill out standard soapbar hole, but dimensions wise it was spot on.
In future I'll probably add 3rd pickup, but that will have to wait until i think whether i want it closer to bridge or closer to neck
Attached you can see how extra long elixirs fit on the bass brand new