I've completed phase 2 of the testbot: besides (32 and 64 bit) Windows executables you can now also submit patch files to the bot. The bot will apply the patch files to a clean git tree, cross-compile the test and run the test on Windows VMs. You'll also be able to download the cross-compiled test executable to test it on different Windows machines.
I've had to reverse this change for now as it causes major problems.
Ge.