The land of Blockland!
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One issue.
Sometimes when a Blockland sign is placed, the terrain disappear.
I see this occur with most of the signs.
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That's probably the first thing everyone will try when this is released publicly, lol. Those issues may have to be addressed in the next update though; no easy way to fix them.
Update: ModTer support for terrain is basically done! The generator now supports using all ModTer brick scales for terrain; it also works for caves and detail bricks (prevents floating and buried details). All I left to finish for ModTer is making it work with clouds, floating islands and skylands, and then PTG will be significantly closer to release.
When using the "Cubes" ModTer type, you can overlay Plate-Capping, to create a new, hybrid type of terrain. Also pictured below is a false color imaging system used in setting up the rules for ModTer brick placement: