ATM - Truss Tube configuration for 8 inch f8

I'm currently trying to design a truss-dob mount for an 8 inch f8 mirror which has been in the family for about 25 years (and was made in the UK by George Hole in 1948). It has been lying in state in a cupboard for 20 years or so!

Following the almost universal pattern of design that many members of the group use, the telescope would have a square mirror cell and a circular top ring. The truss tubes rise from the corners of the mirror cell and form 4 long triangles. Given that my mirror is f8, and the mirror box is only going to be about 10 inches square the whole assembly is going to be relatively long and thin! My dad is trying to persuade me that a better design would be to have a square top 'ring' so that each pair of truss tubes would cross over in the middle. They could be clamped together at this point for added stability. His arguement is an empirical one - the shape of the triangles formed will be less acute.