I´m a arctic guy in Sweden, but maybe you skidoo gurus could help me.
A friend to me has a summit600 144" -04. And he will let me rebuild it to a real longtrack hillclimb sled.
I´m thinking of a 159"*2" camoplast track, extroverts, tunnel extension and rail extension.
Is this a good idea?

Should I do a setback?
Could I use a stock 159" tunnel extension? Or aftermarket?
Any tips!

Thank you