Thanks. I'm still looking for a good, stable and capable structured drawing program for the Amiga.
ProVector seemed interesting, but it too was crashy. DrawStudio is quite capable, but I have to run it in 256 colour mode, or the bounding boxes disappear on my Cybergraphx setup. Still it's the best I've found.
Would be great if Art Expression wasn't so crashy. I'm used to it by now though (trying to use 12 year old software often has unpredictable results).