This new feature is under construction, now, basically following the mentioned approach: An additional dropdown menu was added to StitchBuddy‘s preferences to pick an image, enter its real size and if it should be tiled. The setting is considered on screen and when printing / exporting JPEGs.
I will introduce a corresponding view option, and perform some more tests as this update might be bundled with other internal improvements. Expect a new beta testing in a few weeks time 😉