You should look at Kicad (which I use and can comment on) or similar programs the board you see there the grounds were only thin tracks to join up the pins then all I had to do was select the whole board then Kicad filled every bit of area I had not used and made it a ground. Yes Marc short paths , loops etc can be a nightmare very much so in the other projects I have made that generate 5 to 100 watts of RF energy from 50 to 400Mhz here I have learn't that if I have to cut that ground plane I then have to put jumpers across that cut but that was when I made it all by hand on single sided board. I think Neil will get to the bottom of this and we all will be better off from this.
Regards Paul
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