What year is your helicopter? I know it is a Hiller Raven, but what year and when was the last time it flew?
The initial response from the folks I know that do this was not positive. If you are flying a certified aircraft, the manufacturer is the deciding authority on, trust me on this, cracks in canopy bubbles and doors and the required fixes to maintain that certification. An AP will insist on that before signing off on the repair. Any fix must have a basis in the certification.
I really want to help you with this. So, what manuals do you have from Hiller? That was their first question.
Let's start here:
https://hilleraircraftcorporation.com/all-model-revisions-publication-status
Or here:
https://www.aircraft-reports.com/hiller-hte-h-23-oh-23-raven-helicopter-manuals-bundle-on-dvd-or-download/
https://www.eflightmanuals.com/ITEM_EFM/SDETAIL_EFM.asp?mID=1151
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2499334.m570.l1313&_nkw=hiller+raven+canopy&_sacat=26435
If you don't want my help, I understand. Remember I have a lot of hours and factory time in helos...you may need help getting an airworthiness certificate. I could be wrong.
Let me know.