Looks good, I think you need to add a cross support at the fork tips, with a flat brace under and another top brace that has a u-shape notch that fits the saw and secures it from moving up, down and sideways, hold it on with bolts on the outside of the tips. That would be a 2 piece strap that you could just fit the top piece over the square saw and bolt it together, for easy removal. __U __ top or bottom with another flat one.
The same type of brace you have on the bask, put another on the front, except add bolts instead of C-Clamps. But don't drill any holes in the forks.
The same type of brace you have on the bask, put another on the front, except add bolts instead of C-Clamps. But don't drill any holes in the forks.