This is actually only a medium size set-up.
If it’s too big for you to handle, then drop your number of areas down to 9 (3 rows of 3), and triangulate your lighting (3 equilateral keylights to each area). Your total fixture count will only be 27 units.
Use a bigger lens to achieve the proper diameter beam, and be sure to pump up the boxer’s corners with a head on special.
Your truss height will be determined by your arena ….and the height of the ring. Maintain a steep 30 degree angle — or steeper — to the areas, otherwise you’ll fall into the trap of creating a glare in the fighter’s eyes — blinding them unecessarily. (Think of the old gunslinger’s trick ….. keeping the sun in the eyes of their opponent during a shoot-out). This would only anger them, creating an unfair advantage in certain positions; and perhaps then you’d be the one with the black eye.
Good luck
DS