Centre locking wheel hubs to suit Skyline GTR

[nismoGTR32]

What I'm trying to find is anyone knows where i could have these made or anyother leads as to how i could source these.
I'm building a GR.A replica GTR and as a lot of the users on here are experianced in building race cars i thourght i would ask the question. Now being 4WD the hubs would need provisions for driveshafts both front and rear.

[2002 turbo]

If you are in Sydney maybe try Bosnjak Engineering, they make the kind of stuff you are after.