cheers for that Jay, I've got a version of that but it wasn't quite as detailed. Some of the areas are a little more visible now

I've also got lots of googled reference pics from various models (think they were taken at exhibitions of the originals or something) but each has slightly varying layouts. An example is directly behind the astromech droid on the originals there is a little gap before the next raised structure. On the technical plans however this is missing.
I think it'll be a hybrid of them all - maybe a 'mark 2a' model