Not really, 800VA toroidals don't come much smaller than the one I have and in any case, it's already cost me £50!  The par-metal.com case is big enough and it's also considerably cheaper than the iagaudio.com case (and not as nice looking, I know).  Also, since iagaudio.com didn't respond to my e-mail request about custom sizes they don't get my business

Michael.