If you decide stuff from the top down, then you just have a fantasy. You can't fill in the details later because the details don't fit.
I understand your viewpoint, and do not expect mine to translate without direct experience. The top down approach is, ideally, not something created by the physical mind. The grand picture is fed into the physical personality which acts like a receiver. It happens in a flash. So you are trusting that what you receive comes from a level of existence/yourself which has a much broader viewpoint, and is attempting to translate it down into your own mind's symbol system. It may not convince anyone else, often do to the lack of detail, but inside you can understand quite clearly. The problem is turning the vagaries of mysticism into useful information for society.

Ignoring frequencies because you dislike that model, do you have some preferred idea for different dimensions and how they operate?