Myself, I'd be tempted to go for something that doesn't have 'square' holes, but more shelves which were longer or deeper.
(I have a discontinued range, so not much help there, sorry)
Maybe even something you can put doors on - dust seems like it could be an issue, unless you add a lot of boxes inside the cubes, and then you're starting to spend good money on storage systems instead of fabric and patterns
Even, for now while you're thinking, couldn't you use clear stacking boxes of something? Then there would be no furniture to get assembled, and no-one is going to see it but you are they?
Good luck
Leial