I'm quite surprised that the kiln got up to those sort of temperatures given its size. At 10 bricks + a paving slab, it's the sort of thing you could fairly easily carry to the beach or some other isolated spot if you live in a flat and don't have access to a garden or yard (check your local laws to make sure you can do it legally, of course). Also, barbeque charcoal is cheap and easy to come by (maybe less so in winter admittedly).
I think I might try to make a small mug next