Julian,

Thanks for posting this tune.

You forget to return it to 4/4 time at B.

The second ending is actually the end of the tune. If you want to be able to repeat the form for soloing, I would take out the first and second ending marks, and make the second ending a Coda, jumping to it from the Bb7#5. Then it will only go to the final Eb∆7 after all the solos.

Cheers,
Jer