2) Z or any other company for that matter may not want to pay more than a one-off commission for the introduction - I think 10% may be top of the range they may be prepared to pay
3) consider being 'prime contractor' and add your own markup onto what Z or other company want to charge - however, this leaves you responsible for everything and you can be sued - so you need a good back to back agreement and you will get sucked into every issue that arises which really is a job creation scheme for yourself so make sure your mark up rewards you well for this.
I don't know much about the value of this etc but if its small then take the commission, if its big then you have a job!
Good luck and let us know how it goes!
And if you need help on a paid basis you can PM me

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