Sorry about the poor picture, I'm going to borrow a digital camera and take some better ones tomorrow (which I need to do anyway before sending the fork back to the framebuilder). I'm also going to bring it to some of the better bikeshops around town and see what people think.
About the indentations being off-centre, that's correct: none is at its deepest facing directly forward. I've started measuring this and that, and the dropout distance is about 98.5mm, which I suppose isn't great, but wouldn't have alarmed me in itself. Next, I'm going to put in a true and perfectly-dished wheel, to see if there's any alignment issues.
Will report back with pics ASAP.