" it’s also only available as an Altium design at this point and not KiCAD yet" -> Is there a LimeSDR 3D Model?
But there are pdf’s of the schematics
socket (micro USB Type-B) https://github.com/myriadrf/LimeSDR-USB/blob/master/hardware/socket/1v4/LimeSDR-USB_1v4s.pdf
plug (USB Type-A) https://github.com/myriadrf/LimeSDR-USB/blob/master/hardware/plug/1v4/LimeSDR-USB_1v4.pdf
EDIT: Mixed up plug and socket, it is A and B, I had B and A.