Measured with a calliper best I could and it seems like the chainline is about 50mm…is that too far out? Like I said I have two spacers on the drive side of the BB would taking one off be an option?For skinny tubes, a chain-line of 47.5mm was the Shimano spec. for MTB if it helps. Anything around that value will be OK.
Looks a well capable bike
To size the chain I put it on the largest / largest , attached the quick link pulled it together where it could be joined then counted two rivets down and cut there. Is this correct?