The tabernacle and the ark can be challenging to read through in Exodus. There are a lot of details about how things were to be made and what they were to do. As we read them, it's important to see that things things were meant to be shadows of future things in Christ. Christ is our Mercy Seat and we are being built into his dwelling place.

"So then you are no longer strangers and aliens, but you are fellow citizens with the saints and members of the household of God, built on the foundation of the apostles and prophets, Christ Jesus himself being the cornerstone, in whom the whole structure, being joined together, grows into a holy temple in the Lord. In him you also are being built together into a dwelling place for God by the Spirit." Ephesians 2:19-22