I was curious is It possible to use Schematicannon (Which I love <3) in exchange of Builder (this lazy thief) from Minecolonies. But Minecolonies schematics are in .blueprint format instead of .nbt and I have no idea how to convert them. Builder have to place last block to complete the building, so It should work.

Hi, sorry for not getting back to you sooner-
We are all for working together with other mods and plan to add plenty of interactions in the future. As of now, though, we are working hard to build a proper foundation to the mod itself. Once we are happy with Create's fundamentals, we will start building APIs and develop features that reach out to other mods.

Create uses vanilla's .nbt format for schematics. For compatibility, you'll have to bug the minecolony devs to provide you with .nbt structures instead of their own custom implementation.
Cheers!