thanks for all your opinions.. I now believe i will not use this tower and wait a bit longer and get a tower manufacturer to engineer a new one to suit, as there were some good points made there which i was blind to consider!. I was a bit hopeful that i could use the tower i have but i now am sure it wont be an option
And yes, its about 12 feet across (triangle) at the base and tapers up to the top which is only about 6 inches wide.
6" wide for a triangular tower won't support much of anything in the way of an HF beam antenna.
It might be possible to remove a section or two, making it shorter but also wider and stronger. I'd look into that possibility.