OK, so the dash has been trial fitted and after much trimming and juggling, now fits a treat. The next issue was starting to fit the switch gear, the most awkward to physically fit being the light switch. Because of the way the switch works (pull out once for sidelights and then again for headlights plus twist the knob for increase/decrease switchgear illumination) it is hard to fit into the new dash.
This is because it is recessed into the mouldings of the original dash, by the drivers vent eyeball and, if mounted flush on the new dash, has a lot of travel outwards and would stick out too far.
So to make it work I first cut the switch knob in half;
Then the end with the recessed nut in it was pushed and glued into the other end, thus shortening it;
Then I fitted a block of wood behind the dash, drilled it, and pushed the cut off retainer from the old dash over the light switch shaft, I also filled the empty inside of the light switch knob with a cut down old bump stop I had lying about and placed some small grommets over the shaft, to give it some support, as the retaining screw is now at the far end;
Then the switch unit was pushed through the hole in the wood and the old retaining sleeve glued in. This means that the switch unit is still removable should it ever conk out;
Now only a small amount sticks out if you pull the switch all the way out for headlights. I have ordered a soft rubber concertina sleeve (as used on radio control actuator shafts) and all I need to do is unscrew the silver knob and slide the concertina over the shaft, then when the switch is pulled to its furthest extent the shaft of it will be covered.
Did another trial fit of the dash and there is plenty of room to get to both the switch unit and the plug.
It sounds quick now but this has taken me about three days of head scratching to work out....one of the joys of a kit car, each unique problem requires a unique solution (and a garage full of junk often comes in handy)