Persichetti Exercise 4 - 36 for Brass Trio

I come to you with yet another quartal exercise from Persichetti's "20th Century Harmony" - this time for a trio of Trumpets.  The prompt was "4.  Continue the following passage for trumpets preserving the general character."

Thanks for listening and I'd love to hear any of your comments, suggestions, critiques or just observations!

Fantastic. You took the exercise to the extreme without compromise. Everything is vertical structures. But the sound is very consistent throughout and captures the interest.
By the way, that book by Persichetti is wonderful.