I'd love to see your sled on a scale, wet or dry. I have an edge as well with many similar mods and mine is over 100lbs heavier than yours dry...so call me a skeptic.
As far as the original topic, a guy with the user name winter on this forum builds some very light reliable sleds, but last I heard he was getting out of the game.
X2 but it is sad news that Shannon is pulling out of it. He had done 2 summits this year that are top notch. If he changes his mind I write him a check without hesitation