Are these nib walls coming up from the floor or coming out from the wall? Are they merely side panels of the cabinetry, or structural?

just realised that my suggestion has overlapped with Dr Retro and i agree that you should be able to have (from left to right) a 900 wall cabinet with three equal doors, a 900 wall cabinet with the 900 wide rangehood and three equal doors and a 600 wide wall cabinet with three equal doors ie 8 x 300 wide doors with the left hand side of the range hood wall cabinets lined up with the 900 corner cabinet BUT is there any special reason why the wall cabinet for the rangehood was suggested as 1000 wide?? if so, the same concept applies ie left hand wall cabinet would be 850 wide with three equal doors, 1000 wide range hood cabinet with three equal doors, right hand cabinet 550 wide with two equal doors..ie 5 doors about 270 wide and 3 doors about 330 wide above the rangehood but aim for the 8 x 300 doors.. the cabinet maker should allow for all the necessary clearances and fillers to create a uniform appearance

Hi Bee everything you have done looks lovely but it lacks practical storage. The day bed does take up a lot of space but if hubbie loves to watch Netflix can't argue with that what does he watch it on? because you are video conferencing it would serve both purposes to have a larger screen on the wall opposite the lounge above the desk for Netflix,computer and conferencing. The pretty open floating shelves currently above the desk be moved above the lounge and replaced with full width and height bookshelves Your new hanging book shelves really are only decorative and will block the view into what is already a cramped space and won't store very many books can you use it elsewhere. The art work on it's own would look better and more open. Can the rug be pulled back further or sideways to avoid the door You need to try and keep things off the floor to give a more open feeling. I hope the following might help to show where I'am going with this (siriuskey)

I think you can definitely go with same width and semi-recessed since you would like to have as much cabinet space as possible. We've had lots of customers getting same length vanities and mirror cabinets before for design or storage purposes, and their results look great. I've attached below photos from their projects for your reference ;). Same length can look great especially for rectangular mirror cabinets.