Yes, the space between emitter and reflector is flexible but most building scientists I've read use 3/4" as standard. To my mind, just getting reflective building paper is as good an option and much cheaper as the bubbles are rather useless as insulation. If I could find the research article done by CMHC in Canada and sited by the Building Science Corp in Mass, I would produce it but.......it's been a while.
Your tubing layout is top drawer, BTW. Very professional. You will snip off the cable ties, I hope. haha.
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