Mast Steps

[SV Papillon]

nice concept

I would suggest some type of non-skid for the top glued or painted on the angle before you cut it etc. If used with a harness, lanyard around mast and halyard with someone belaying it is a very good tool for going aloft that should be safe for anyone. I can see some pretty big issues selling them as a sole means of working aloft, which it seems is your pitch?
good luck
Jake

PS probably a good idea to load test one as a reference