Bit late to the party seing as the original thread was started in 2010, but...
The mid 70s Norlins have a rounder (C shape) neck and are a lot more narrow at the nut. Justin accidentally found this out with the red SG with the odd controls.
When that guitar got broken, he searched for a similar year/neck shape SG as he liked the feel of the neck. That's the one in the picture. This guitar has had a million and one changes/repairs plus a bunch of neck breaks but it sounds great, and he loves it.
He still has the old broken one knocking around somewhere I believe.
Hope this helps.
Cheers.
Marshall.