In this GIF, you see how the rings flowing around the main centre connect and then release from different planetary sections. If you were to remove the base, keep the centre, making that the main engine section, below that will be the Eye of Harmony, and above the centre section is the main console room, the rings being the pedestrian pathways, or corridors, and the planetary bodies would be different rooms, with their own gyroscopic rings as additional corridors to smaller sub-rooms . This is what the model of the TARDIS interior dimension in the TARDIS technical file, and the Time Lord compendium was primarily based on, in addition to Peter McKinstrty's Model, and the screen image noted in the Journey to the centre of the TARDIS. this is how I see the TARDIS inside it's own bubble Dimension. Tunnel pathways and anti gravity lifts cut through the central core engine sections and link up with various corridors revolving linking to higher rooms outside the centre or closer to the bottom section denoting their floor placements. For example, those rooms floating above the main section and corridors rings that touch them would be upper floors, those rooms floating below the equator and below the eye of harmony would be the lower decks and rooms, also linking up with their corridors when needed.