Success, all assembled and looking like all the joints are as they should be.
One last change is now needed. In the Isometric view the Front is shown as 'Bottom' on the cube, and that is upside down!
I have done some searches to see how I can correct this but not yet found an answer.

Thanks again for the replies. Trial and error make a great teacher! I have now found how to use the Steering Wheel and to move it about to get the desired orientation for changes. I have also learnt the correct Select and Extrude process. My panels are now all drawn and so I am onto Assembly. Even w...

Thanks for the replies. I haven't tried but I believe the Community Edition restricts its file sharing ! I have made some progress. hovering over the drawn slot identifies it in Pathfinder. Alternatively you can click on the likely entries in Pathfinder until it highlights in the drawing. This produ...

HI, I am new to SE 2023 Community Edition and feeling my way by trying to draw a box for a small Sub Woofer that I previously drew with my old CAD software, please excuse me if I use the wrong terminology. The box is made from 18mm MDF or Ply and the panel joints are made by using 6mm edge tongues i...