I was mostly waiting for more screenshots, I dont know what all the tiles are... for example bottom left, looks like walls (?) or the six similar-looking tiles center right, windmill (?)
But I see correctly that you managed to override vanilla buildings with unique tiles? I thought mifki had not released that yet?
Center right is windmill of course, and bottom left tiles are for siege buildings.
And no, mifki haven't released anything new yet, so i could only replace existing tiles with new ones. As you might notice, all workshops have the same tile arrangement and colouring as they would in vanilla DF.
Also these workshops have a somewhat disturbing behaviour - they also replace any item or creature that step onto them, if they happen to match the workshop's override settings.
Also another screenshot