Hi Bird, I'm interested, but it has to get in line behind a few other projects I've been putting off...
I guess how useful this approach would be might depend a lot on the local environment too - how stable and consistently temperature typically varies at one's prime observing location (eg. my backyard), by how much and how quickly. Brisbane might be a bit milder/predictable in terms of night time temperature variation than many other areas - I'm guessing here!
cheers,