Let's take a look at what the Holy of Holies (the Ark room) of the Tabernacle looked like when the High Priest was inside. The High Priest would usually enter this room only once a year on the Day of Atonement and had to take special precautions as outlined in Leviticus 16.
Here is the Priest in the Holy Place of the Tabernacle:
As you can see from this next image, the two side Partitions (Parochet) could be moved towards the Inner Pillars to allow the Priest to enter into the Holy of Holies room:
As you can see from this next image, there were plenty of space for the Priest to come through:
Now, let's follow the Prist insode the Holy of Holies place. This is the view right from the left (south) side of the room:
Here is a view from a different angle, so that you can clearly see the reflections of the room:
And here is the view from the south-west corner of the Holy of Holies room looking back toward the Holy Place of the Tabernacle:
And this is the Holy of Holies place of the Tabernacle. Enjoy!