Thank you to everyone for their kind words and suggestions. I have always had a great fondness for the natural beauty of wood grains so this really has been a labour of love.
As my signature shows, I have many different horns and have tried my Martin and 37 and 72 Bach bells on 'my creation'. While the Bach profiles are fairly consistent, the Martin is quite different and they all seem to fit fine with no real issues of instability but like any trumpet stand, they would go over with inattention or carelessness.
Thanks again and let me know if you would like me to work on something for you.