Henning Stummel Architects designed a modern extension architecture of the house that placed all the bathroom facilities into their own structure tacked on to the house and accessed via extending the openings to the existing fireplaces on the first three levels. the cross section of the window detail and siding are very cool, The architect works hard to create like the windows are installed flush with the walls sheathing and the sanded Perspex boards are installed just like and on the same plane as the wall cladding.via