We've left 140mm gap between the tops of the upper kitchen cabinets and the ceiling so we can box it in. We're going to use 90mm coving so there will be about 50mm of actual boxing visible and rest will be covered buy the cornice.
I was going to do it myself - any tips on a simple way to frame it given that it's not a big gap?
Re materials - I've heard that MDF or Gyprock are the two materials which are typically used for this. Is there any reason why I can't use plywood or a piece of sanded pine board? We live remote and there isn't any MDF available...