Yeah, it looks like it just might get worn out from the screws in there. Plus there is not heat sinking action, the motor might run a little hotter than it could have with an alum plate. It does look generally rigid though, with the thick plastic ribbing on it.
“The modern astrophysical concept that ascribes the sun’s energy to thermonuclear reactions deep in the solar interior is contradicted by nearly every observable aspect of the sun.” —Ralph E. Juergens