Looking good Ali, a nice way to keep the kids amused during the hols too.
Anyone who doesn't venture out of shelled should take a look in the habitat section... Hadesdragon has a great thread at the moment on building a viv from scratch with a fake rock enclosure. There was also a thread a while back which showed pics of someone (sorry I can't remember which user) who dug up their whole back garden to create a haven for his tort - I can't find it now though but it was amazing.
Like Ali said... it must be all those years of kids watching Blue Peter that makes these people so creative.