Abendwind, thanks for the observation.  The wing is not quite symmetrical.  The lower surface is flatter and the upper has more of an arc to it.  So there is an airfoil profile, however, probably not enough.  I can cage it and make it a bit more prominent.

It is a bit like an NACA 2415 airfoil which I thought would go with a high aspect ratio wing.  We really don't know what the L133 looked like in detail, only guesses.  I'm pretty sure the landing gear configuration is incorrect.