"Make for the tent a covering of ram skins dyed red, and over that a covering of hides of sea cows."
Rams were used to consecrate the Priests. One was used for the consecration and another was burnt as an offering. Jesus Christ did both in himself. He was both the consecrated priest and the offering for our sins.
The ram's skins were dyed red to represent the blood Jesus shed.
"For without the shedding of blood, there is no forgiveness."
No one knows for certain what the outside covering was. It is called many different things is various modern translations. What we do know is that it was some sort of tough leather that could take a beating, like Jesus did for us. It was not an attractive covering.
"There was nothing beautiful or majestic about his appearance, nothing to attract us to him."
This unattractive covering protected all the exquisite beauty inside. Non-believers can't see the beauty of our Savior. All they see is an ordinary man (leather) or maybe a great spiritual leader (fine leather). As believers we have the wonderful privilege of gazing on the exquisite beauty of Jesus Christ our Savior.
*Hersberger, Ervin N. (2010) Seeing Christ in the Tabernacle. Harrisonburg, VA: Vision Publishers.
For the wages of sin is death, but the gift of God is eternal life in Jesus Christ our Lord.
Just as people are destined to die once, and after that to face judgement.