Putting this here just because it's something I often find people aren't aware of and it's somewhat relevant:
If you want to run 10.3 on Google Compute engine, official images from the release engineering team are available.
Quoting the release announcement:
% gcloud compute instances create INSTANCE --image freebsd-10-3-release-amd64 --image-project=freebsd-org-cloud-dev
% gcloud compute ssh INSTANCE