Nice work Niner
Im working on the same thing but thinking of changing out the bolts in the tank to some longer ones. Anyone done this?
I ordered a chromoly short post from Canada Sled parts and hope to get it 3/4 of an inch forward which at the bars as you point out will increase about an additional 50% forward. I've always used the Rox riser tilted forward about 45* which will help even more.
I know the M is old but if you can keep you body up front the sled works much better climbing and side hill. IMO