historic australia dioramas and gelatine

Hi to all on this forum.

I am making a series of dioramas showing life in early Australia (Richmond, Tasmania) and starting up an interpretation centre in the town.
For those interested have a look at http://www.whitepage.com.au/richmondtasmania

Also any ideas on the use of gelatine for water features?
It seems great after a bit of experimentation but I'm not sure how long it will last, what will happen on a hot day or whether it might go mouldy.
Anyone ever used it before?
It sets really clear with a rubbery texture and seems ideal. But...?

Thanks all

Alan