well guido,
it seems you have already made up your mind
so why come here and ask us for feedback and then throw it back in our faces?
it sounds like you already decided to get new masts and just want confirmation on your predetermined decision.
so go back to my first post.
if you want a short mast to help aid in your problem solving then order some and wait for them.
And in the meantime get your signage, floor markings and warning devices and all railings etc. in place and up to good working order. You'll have plenty of time to do that being it will take months to get all of your lift masts built and shipped and installed.