You don't need the resin to make transparent cellulose-based materials, this research group did it in 2009 with just compressed celluose nanofibers, although the resin likely strengthens it. Notably, pure cellose material has a low coefficient of thermal expansion: (available on sci-hub)
Optically Transparent Nanofiber Paper (2009)
By Masaya Nogi, Shinichiro Iwamoto, Antonio Norio Nakagaito, and
Hiroyuki Yano
> "The thin cellulose nanofibers tend to collapse by capillary action during the evaporation of water, and the deformed condition is fixed by hydrogen bonds that form between hydroxyl groups of the cellulose, thus producing a high-strength material without the use of binders."
Optically Transparent Nanofiber Paper (2009) By Masaya Nogi, Shinichiro Iwamoto, Antonio Norio Nakagaito, and Hiroyuki Yano
> "The thin cellulose nanofibers tend to collapse by capillary action during the evaporation of water, and the deformed condition is fixed by hydrogen bonds that form between hydroxyl groups of the cellulose, thus producing a high-strength material without the use of binders."
see also https://www.nature.com/articles/am2009122