Welcome to the forum, Sam. We got a few things in common here. I'm semi-old (48), I build 1/48 WW II aircraft, and I was a sound engineer for 20+ years, doing mostly hi-power (5-10,00 watt) hard rock. Sorry I can't help you on the canopy. All my Zekes are Hasegawa, & they only give you 1 canopy. Did you try checking www.squadron.com for a vac replacement ?
Good luck, I'll see you over at the aircraft pages. Have fun !