I have been using woven fiberglass for an I beam in my takedown sleaves since the beginning. It is incredibly strong, much stronger and less flexible than phenolic and also glues easily.
I also use it in olverlays and tip material. Oddly enough, even though it is so strong, it works and shapes easily. Only downside is that it only comes in black.
Gaboon ebony and phenolic has a cubic foot weight of about 80 lbs +- and this glass is closer to 110lbs per cubic foot.
I have laminated 1/8" stips together to make a solid riser and the glue lines were in determinable.
BigJim