Excellent review
May I just had that the hideout/cat house isn't really suitable for a Syrian as the holes are bit small and there is a risk of getting stuck, but it is easily removed
And I have to say the cage looks really nice on your photo. The effective height can be reduced by having the substrate deeper but for a dwarf hamster it may need more shelves or other items to prevent fall risks as well - depending on how it is set up.