Where can i find a tuning guide to Rowsell sails looking for some info on rig tension and rake for a ali mast

The members area of the web site has good tuning advice

yeah i have that one cant find anything on rig tension any pointers?

Stop being so precious, twang it up, give the fat boy a pie and get it down there!

Is it hog or deck stepped?

If it's deck stepped accepted practice is to just "snug up" the leeward shroud while sailing to windward. This is not specific to any particular sailmaker.

Hog stepped is a little differant. When I sailed a case stepped NSM II I found the boat needed as much rig tension as I dared put on. So did the boats owner! This was with alverbank sails which were rather full and had lots of luff round so prebend would have been a good thing.