Lol, I work at Dunton too. Although WFH too.Hi there Alex.
I'm currently working from home at the moment with all my CAD workstation, usually I'm at Dunton, (Ford's centre in Laindon). They've got all the gear you could ever need/imagine, unfortunately they're not big on sharing and helping out guys building N1 race car. 😢
I find that you can measure up hard points pretty easily with a range of measuring equipment, (rulers, callipers, angle gauges etc), from there you can usually eye the rest of the structure joining these points up. The upright shouldn't be too difficult, the spat on the other hand is all A class surface and not easy to measure as you'd image. If one will be a 'reproduction' why not both? i.e, buy some replicas. I know its not going with the ethos of your build, but if you don't have two,...........
Yeah, my plan was to measure the upright by hand. The reason I wanted to do the spats myself is because no one makes them properly, they don't go under the car enough. Also wanted to learn some medium-complex mould making and composite skills so I can use them on other components too.