Is there a tutorial somewhere on making that Sontaran ship? I remember AEG posting something about his, but can't find it.
Have you tried his blog? I know he used a plain bauble you buy to decorate yourself from a craft shop.
Mine was coated in a gold effect that I took off with wire wool. I drilled holes along where the door was going to be, cut out the doorway then trimmed and sanded it smooth. I made the door (slightly larger than the doorway) from another bauble and then cut the bottom of the bauble off at a slight angle so that it resembled the one landed in the Experiment. I used this hole to put the door in the doorway.
Hope this helps