An update!
I finally got on with finishing the interior side panels off. Well, I say finished..they are 90% finished..they still require some sanding and smoothing before I glue them to the chassis.
I used a service manual and a photo I took of one I restored to get the general positions of the holes etc in the interior panels. I made a side panel from sheet styrene, scanned it then in paint shop overlaid the bits of the images from the manual and photo. I then printed that out 1:1 and used it as a template. I modified the design a little in the final stages but I wanted to use the real car to get the general look right.
I then cut them from two sheets of styrene which were then laminated together. I'm quite pleased with the effect so far. I have to make the door opener levers and the actuator rods yet. I also modified the rear firewall and reinforced the center tunnel in the floor as it was a little weak there. The exhaust now runs out under the side skirt too. here's some pics...