I see that this is a need in several places and a lot of guys have done it.
Got all my glassing stuff as recommended by Blwalker105, been reading up and videos on techniques for layups, fillets, cutting etc. But no luck on how to prepare the inside surfaces for, for instance, installing a threaded stud for the rear of the roof or B pillar, wire bundle standoffs, or the scoops for side sail vents to the intercooler.
Nor for how one prepares the stud itself, though I'm guessing just a washer. Or a body washer and nut to lock it, then one (two, three....?) impregnated layers of cloth....with a hole in it....after stippling the surface...but not completely cured...
You see what I mean.
Many thanks