This is what I cam up with. Is this ok? I also included the midi of this notation. Sorry for the dirty work haha
Don't worry about how tidy it is. Transposing confuses me so I may be wrong but is the alto higher than the trumpet? It almost always goes Trombone, tenor, alto, trumpet
You're right, trumpet has a higher range than alto. But the way i tansposed mine is that i worked on the alto first, then the tenor, then the trumpet and lastly the trombone. So based on your given 4 part harmony, i used the first block from the top to the trumpet, the second block to the alto, the third block to tenor, and the fourth block to the trombone.
Btw, nvm the 39th measure on the tenor. I forgot to remove the notes