Try locks knobs and knockers in Clifton hill. They may be able to refer you if not help.

Hi Dr Retro, Thank you. I really appreciate the input and the time you've taken to explanation your point of view. I really do want to get an understanding of where the issues lie in this design. So I hope you'll forgive me digging a little deeper. I don't quite follow why you think the design would require a 6m lintel. Yes, it does require a 6m track, but the track can simply be attached to the wall. The weight of the door need not be supported by the top track. It could be supported from below. The whole point of putting the configuration on the outside of the wall is to minimize the need to make structural changes to the building. There currently is no capacity to install a 6m wide external sliding door/window unit. Likewise I don't follow why the door should be any draftier than any other external sliding doors. The cavity is on the outside of the wall, so draft is not going to get in via the cavity. Other sliding doors of the unit type have the same draft problems this configuration would and solve it by using an overlapping flange at the front end of the fixed door and the back end of the slider. The same could be applied here, where we treat the wall as the fixed door.The point at which the doors engage each other has also be solved for other door configurations. It is just a matter of having a loose tongue and groove configuration. Again this is exactly the same as a unit providing center opening sliding doors. Finally the same sliding mechanisms are used in other sliding door configurations, so I don't see why that should be any draftier here either.

agree with bigreader ...the slidingglass doors look good in the exhibition homes but the space between the sliding door and the last cabinet or washer will be awkward to keep clean and a great place for lost sox but it depends on the size of the laundry...if there's enough space for the cabinetry to go right up to the external wall as well as having a sliding glass door that can avoid the odd gap but need the room will need to be at least 2.5m deep and how do you create privacy for the sliding door?...i prefer a hinged glass door and small window for light and ventilation without exposing all my laundry mess to the world and simple venetians maintain light and privacy

consider Colorbond steel fencing panels, the same profile as the fence and similar colour to the pool house, easy to cut and install using gate fixings and readily available at Hardware and fence suppliers but try full height vertical doors of the half lift up door