Cool move Faster, looks like that could work. I was worried that the track could not handle the load of a vang but, thinking about it with the right hardware that could work, wonder if it should be made out of aluminum
: Also when I get around to running my lines aft I think the big mast step I have would be good to mount padeyes for the blocks, I think drilling and tapping into the step with heavy hardware for the blocks to connect to would be better than putting a stainless mast step under my mast. Here is a pic of my mast and step sorry it's bad but I looked through a bunch and this is the best one
PS you can see the marks I made for the boomkicker (it's itstalled now), the vang needs to attach lower to get the right angle to the boom.