After testing the Windows 64-bit build a bit more, I've added it to the Steam configuration. On 64-bit Steam Windows installations everyone should now be playing the 64-bit build and on older systems the game will use the 32-bit build.
Report problems or feedback here.
You're welcome, have fun playing and building! Thanks for posting on the forums.
Also: there are a lot of players (including me) who appreciate your buildings and dedication to the game. I hope we can one day all be friends and play together!