anyhoo, the side piece is designed to slot on over the chimney at the end of the manor house like so:
it's a bit more fanciful than the main house, but I've tried to give it a bit of character to match the vague idea of phases of build (with the manor house having a newer wing attached to an older converted hall), so they've used the remains of an old watch tower and added a timber frame on top - once the timbering is done, there should be sense of stone work trimmed and patched to fit the frame in places... in time, with additional pieces I can have a decent coaching inn yard with stables and maybe even a fortified manor house, depending on bits made and used...
I'd toyed with several uses for the new building, but space restricted any stairway, so I had to use a ladder which changed it a little bit in my mind... so I could still make the most of the thinner room over the gate, I figured a loft door would look nice enough and the whole top floor can be just used as storage, which will make furnishing easy, with maybe a merchants desk on the raised ground floor.
the front has an overhang on the older stone base, figuring if you could get a little more floor space you would... as I said, a little more fantasy perhaps, but I'm quite happy with it so far...
