Been 'round and 'round about that 12/6 double neck for years...
OK, it's an SG (small, thin lightweight body), two necks (one of them is a huge head with 12 tuners), = neck dive++!!! (in addition to a heavy guitar in total).
Yes, it has the audience WOW factor, is unique and very cool looking, but very difficult to play, even if you could control the neck dive. No thanks. Not for me at any price. Only reasonable for collectors.