GMM wrote:
A good few things to think about there - Thanks chaps!

Of course, one thing I didn't mention is that these stairs are open
(no risers), and the treads sit slightly above the strings, which
makes it all a little more complicated(!)

I guess if I route (that doesn't look right, but I guess that's what
you do with a router!)

Lol, you rout with a router ;-P