I really love your kitchen and think the Crittall doors would work really well. I think 900mms should be fine. Not sure if this is available and likely costly but I would also think about the possibility of having the glass turn obscure at the touch of switch, so that you can really use the 2 rooms separately, if necc. You could also think about using bi folds internally that fold back to one side. Check out this Houzz article where the owner uses Crittall to keep the kitchen separate too. [https://www.houzz.co.uk/photos/cescolina-apartment-milan-eclectic-living-room-milan-phvw-vp~32232181[(https://www.houzz.co.uk/photos/cescolina-apartment-milan-eclectic-living-room-milan-phvw-vp~32232181)

Can also help anyone looking for steel or aluminium versions of interior doors and since this thread was started there are some incredible new products on the market. Happy to help with product advice and where to buy if anyone would like to get in touch. Hope this helps Nick

Hi Susan. Do you have any drawings or dimensions? We would happily provide you with a few design ideas, for instance sliding doors in the crittal style? Or crittal style doors in Aluminium so much more cost effective? Feel free to drop us an email - hello@massimosky.com

I think this is a really common question for a lot of people. If you only need partial opening (so no bifolds) then sliding doors is the most practical solution, for all the reasons you've given - no doors flapping about, doors don't take up space internally or externally and you can leave it a little open or a lot open, plus maximum glass for light and views. As much as I love proper original Crittal, my husband totally thinks they look like glass garage doors - and that image ruined them for me! Still love them in other people's houses (when done well), but together with all the practical reasons, we won't have them in ours.