The easiest way to create your own rack symbols is to use pre-drawn parts from the Generic Components library.

I would start with a rackmount unit with the closest depth to that required i.e. the 2U 300mm Depth. You can then quite easily modify the side view depth to that which you require.

Rackmount units can be found in the libraries under Racks\Generic Components\Rackmount Units\.

The generic components library also contains many other pre drawn parts such as knobs, buttons and connectors etc. for both the front and rear rack views and they are designed to make it quick and easy for you to create your own rack symbols by simply dragging these parts onto their corrisponding views.

I hope this helps.

Regards

Kevin Harrison