I have decided on which to attempt to make, mainly based on the fact that I found some LM723 round shaped IC's which I had always wondered what they were for.
I spent the morning having a look at the layout of the control board. It will be built on veroboard with important tracks reinforced with additional copper and solder.
I think I have included all the components except the 2N3055 transistors their DC supply and their emitter resistors.
Mike