Comments

It's 6".

It's feels exactly how I wanted. It feels like it is glued to the ground until you want to turn, then it's really snappy side to side. It's an awesome bike and there is nothing on it I'd change.
Very stable and predictable at speed, comfortable on steeps. The only thing I'm not so sure about yet is jumps since I haven't had a chance to hit many on it yet.

Do you need to know how to get it to fit a supreme 6 frame, or a supreme DH? I didn't have to modify it for my DH, but for the 6 I did, which is different from what you'd have to do to fit the 2006 DH you have.
Read the threads I posted links to on Ridemonkey, use Google which is how I found it in the first place. From what I remember you will need to cut the upper part of the boomerang so that the upper guide is only held on by one bolt. Then supposedly the boomerang won't hit the main pivot. I don't know if there's any weird spacing after that though.
Good luck.

I haven't had a chance to really ride it yet. I only finished building it yesterday and it looks like I'm going to have to track down a different spring for the Roco and send it back for their 'custom valving' service. So, it'll probably be a few weeks before I get a chance to really test it out.

If it rides anything like my Commencal Supreme 6 (Mini DH), it should be a lot of fun.
I put a couple better pics of it up as well... much nicer than these living room shots.
http://www.pinkbike.com/photo/1872523/