Update. My thanks to Coomber for a his generosity in karma'ing me the chrome forks. 519s on lx hubs also acquired. The longer fork means flatter stem. Could shorten it and go back to high rise one but quite like it as is. Just been for a quick spin and it rides really nicely after my 29er Dixie. Thanks to all for the build advice and bits to aid completion. I still just gawp at it.