i fitted steps to my last boar, 3x 3/16 monel rivets per rung, never a trace of weakness and i went aloft at sea when necessary (and yes, i'm bigger & heavier than you!)
A french round the world solo fella thought long and hard about this problem whilst in the southern ocean and he came up with this solution.
He tied a bucket to the end of his halyard and threw it overboard when he was doing 8 knots. The result was fantastic. He shot straight to the top.
This is when he hit a problem. He was now stuck up there and had to scramble out of his harness and shimmy down. Not one to be outdone he tied a trip line from the bucket to the boat that was the same length as his mast.
Once again he threw the bucket over the side and shot to the top. on his arrival at the mast head the bucket was tripped by the tripping line and he shot down again. Before reaching the deck the bucket gripped the water again and once again up he shot.
As far as I know he is still going up and down and round and round the world today.............!
PBO turned up yesterday and they have an article on climbing up an unstayed junk rig mast, wooden 'planks' with steps and locating dowels in each 4' length, tied to mast at each joint - looked cheap and cheerful but not sure how it would work at sea. It was (presumably) pushed up the mast section by section - no halliard as this had jammed at the mast top. It also looked as though it could swivel around the whole mast as it did not have a sail slot.
Perhaps a variation on this with slides in the slot for normal masts? It certainly made a stable platform apparently.
dickh
I'd rather be sailing... /forums/images/icons/smile.gif