Exodus 15:17 Thou shalt bring them in, and plant them in the mountain of thine inheritance, in the place, O LORD, which thou hast made for thee to dwell in, in the Sanctuary, O Lord, which thy hands have established.

There is a large "S" on Sanctuary, here, and it says that Sanctuary which the Lord's hands established,

and was this not before the one was built in the wilderness?
So would not the LORD simultaneously dwell in the heavenly sanctuary, while his presence would dwell in the earthly tabernacle, above the mercy seat.?
Shortly after that line is also:

Exodus 16:34 As the LORD commanded Moses, so Aaron laid it up before the Testimony, to be kept.

This has a large "T" on Testimony, and was not this also before the tabernacle was built?

So, is the Testimony the very presence of the Son of God with them, an old testament appearance of Christ as the angel of the LORD who led them?