probably light as it's Ti

 Titanium is hard to weld on, harder than aluminum, because it has to be submerged in argon or some other inert gas. Aluminum needs argon flowing through it, so props to the man who welded this frame. You got skills

 Nice :O rly nice. Better than Kona Stinky etc ^^

 the tubing needs to be purged creating a vacuum inside and then have pure argon(99.999% pure, like 10 parts per million for best results) flowing to keep contaminates out of the backside of the weld, and shielding gas must be kept flowing on the weld until it cools to somewhere around 500F.... actually, other than the set up, Ti is easier to weld than aluminum, it's a lot more like stainless steel than aluminum, just the setup and preparation take a bit more effort.

when I was in school, Ti was something all of us were a afraid of touching, but after repairing a few Ti frames it quickly became my favorite metal to weld.

anyway, very nice job on the frame.... I can't imagine the total cost of that bike, very pretty.

 lol im gunna guess your a welder by trade

 haha, i have 3 years in the industry, and 2 years of schooling.... bike mechanic by trade, but welding is a true passion.

 http://www.pinkbike.com/news/ti-Gear-Box-2009.html

 yeah lol thats what i was thinkin!

 It doesn't need paint, Ti doesn't corrode.

 i no it dosent but it just looks bad i think dh bikes only realy look good in some nice shiney paint the only bikes that looks good raw are bmxes and street bikes