I have a 512x512 version now too! https://colab.research.google.com/drive/1QBsaDAZv8np29FPbvjf...
I keep trying to think of ways to make this more consumable for the less technically inclined, but GPUs are just not cheap. I was on a V100 for probably 36 hours through Colab via my $9 monthly subscription, that'd run $100 on AWS for the same amount of time on a p3. So then I'd need to figure out a tip jar or something to keep the gas tank full.