No worries,

It is a very simple connection, and I find it incredibly frustating that we cannot do a lot of these simple things. Don't get me started...

On second thought however, if you are producing a high quantity of these items you could make some DXF's including the notch out and just nest those. You won't get the same level of detail on labels and reports regarding connectors and seams. However, it would save you a load of time in the workshop.