These parts could probably be replaced by a piece like this
The parts you have, difficult to assemble/disassemble and probably have less strength since they're putting tensile force on the fastener (and onto the flange). The replacement part above puts sheer force onto fastener and your largest flange face.
All these parts each have four flanges each and could probably be replaced by a simple plate similar to this.
This piece is a lot more simple and uses the existing flanges on the big side chassis pieces, removing redundancy.
Sorry if this seems kinda scrap together, I'm writing this pretty quickly because I have quite a bit of schoolwork to still do.
