They do look good - I have a fair few TBM buildings already and all have very good details.
I like the way that these can be configured in various ways - you can have the 4 as a square fort as shown. Or have 2 in a line, and 1 going back at each corner, to represent a castle at the edge of the table. Or even all 4 in a line.
I'm in on a couple of kick-starters at the minute - so may have to wait a little bit before adding this to my collection, but its definitely on the want list!!