Not sure what I'm gonna put on the right arm yet, but his guy is mostly done.
>>8383696I've got the Hidden side castle, it works well as a display piece and has plenty of spaces for minifigs to hang out in. It is a bit shallow in the back, however, so if you're looking for a complete building, this isn't for you. While the front wall is closed up, it hides the transformation gimmick pretty well, and even so, shouldn't be too hard to remove. Overall, I recommend it.
