I thought I had heard that before. I should have searched. Strut plate material - #9 by Untold_Engineering , https://forum.v1e.com/t/update-or-new-version/40835/1346?u=vicious1, 1/2 MDF Strut Plates? - #11 by Michael_Melancon, Material for strut plates - #2 by Michael_Melancon
Dang, I think I should add this to the docs.