H9's 120 Edge was a 78" WS plane - if yours is a slightly smaller one then it was likely the powerline hobbies madel - they shared the same trimscheme for a while. they currently have a .90 size now at 73" WS - but I believe they made a slightly bigger one - might try them for parts. http://powerlinehobbies.com/

Also - the H9 78" edge was actually made by a company in china/tiawan called minicraft. You can currently buy the same plane but without the H9 badging on ebay - http://cgi.ebay.com/MiniCRAFT-Edge-5...QQcmdZViewItem they might be able to help you out.

There is also a seller on ebay that liquidates some H9 stuff - stuff that was slightly damaged in shipping or missing parts and returned - hobbydeals or hobbydeals USA - do a search for funtana and you'll find a few of their listings - might drop them a line.

One last thing to try - stansfibertech.com has a 'glass cowl for the H9 plane - might call him up and see if he will trace an outline of his mold and mail it to you - if it matches your firewall, then you can just order the cowl from him.