Hello James,
I'll be happy to help you retrieve the information you are looking for. Could you please clarify what you mean by mechanical CAD files? Would the layout and gerber files work for you for each board?
If so, the evaluation board design files for the IMXRT1064, can be downloaded here. For the OM13084, only the schematic and the bom is available but I will confirm this information and check if we also have the design files available.
Could you please check the zip file for the RT1064 in the meanwhile and see if this is what you are looking for?
Best Regards,
Sabina