really, nobody has any recommendations for this?

I would suggest supreme think it is in Holmes Rd Manurewa.
I do my own hull repair n
Maintance as owned and run a fibreglass moulding company in the 70s /80s till muldoons sales tax bs killed the industry.

There are several good step by step threads in these forums of people starting out doing thevbasicic clean up then intend to send off to a workshop.. It been suggested to them once they start they will find its not rocket science and will end up doing their own very professional repair
And end up doing so saving a heap of money plus have a few nice tools hanging permently above their garage work bench

Start by striping all the paint of the glass so can see war wounds excactlt what is there and what needs to be done.. Including re doing any old suspect repairs hidden by a paint job over glass.