ATX motherboard with PCIe slots, plus PCIe cards in triple, double, and single width configurations. Corrected and verified by overlaying jeshikat's model on top. [edit] Oh, originally from subtec. Thank you both!
I made this because I wanted a case design aid in solidworks format. I used maker edition, which means it can only be opened with maker edition. I also saved it as step and iges. The step files are saved as individual parts and assemblies, which may make them easier to use on other programs.
Connector opening/chassis keepout area for the PCIe cards (red blocks) are unverified.