Actually, we have multiple accounts written about Jesus by eyewitnesses and those who talked to eyewitnesses. We have the written testimonies of Matthew, Mark, Luke, John, Peter, James, Paul, and Jude.

(Luke 1:1-4 NIV) Many have undertaken to draw up an account of the things that have been fulfilled among us, {2} just as they were handed down to us by those who from the first were eyewitnesses and servants of the word. {3} Therefore, since I myself have carefully investigated everything from the beginning, it seemed good also to me to write an orderly account for you, most excellent Theophilus, {4} so that you may know the certainty of the things you have been taught.

(2 Peter 1:16 NIV) We did not follow cleverly invented stories when we told you about the power and coming of our Lord Jesus Christ, but we were eyewitnesses of his majesty.

Saul of Tarsus is the best witness. He was an enemy of the church. He persecuted Christians. This is his story:

(Acts 26:2-20 NIV) "King Agrippa, I consider myself fortunate to stand before you today as I make my defense against all the accusations of the Jews, {3} and especially so because you are well acquainted with all the Jewish customs and controversies. Therefore, I beg you to listen to me patiently. {4} "The Jews all know the way I have lived ever since I was a child, from the beginning of my life in my own country, and also in Jerusalem. {5} They have known me for a long time and can testify, if they are willing, that according to the strictest sect of our religion, I lived as a Pharisee. {6} And now it is because of my hope in what God has promised our fathers that I am on trial today. {7} This is the promise our twelve tribes are hoping to see fulfilled as they earnestly serve God day and night. O king, it is because of this hope that the Jews are accusing me. {8} Why should any of you consider it incredible that God raises the dead? {9} "I too was convinced that I ought to do all that was possible to oppose the name of Jesus of Nazareth. {10} And that is just what I did in Jerusalem. On the authority of the chief priests I put many of the saints in prison, and when they were put to death, I cast my vote against them. {11} Many a time I went from one synagogue to another to have them punished, and I tried to force them to blaspheme. In my obsession against them, I even went to foreign cities to persecute them. {12} "On one of these journeys I was going to Damascus with the authority and commission of the chief priests. {13} About noon, O king, as I was on the road, I saw a light from heaven, brighter than the sun, blazing around me and my companions. {14} We all fell to the ground, and I heard a voice saying to me in Aramaic, 'Saul, Saul, why do you persecute me? It is hard for you to kick against the goads.' {15} "Then I asked, 'Who are you, Lord?' "'I am Jesus, whom you are persecuting,' the Lord replied. {16} 'Now get up and stand on your feet. I have appeared to you to appoint you as a servant and as a witness of what you have seen of me and what I will show you. {17} I will rescue you from your own people and from the Gentiles. I am sending you to them {18} to open their eyes and turn them from darkness to light, and from the power of Satan to God, so that they may receive forgiveness of sins and a place among those who are sanctified by faith in me.' {19} "So then, King Agrippa, I was not disobedient to the vision from heaven. {20} First to those in Damascus, then to those in Jerusalem and in all Judea, and to the Gentiles also, I preached that they should repent and turn to God and prove their repentance by their deeds.

Paul talks about all the witnesses of the risen Christ:

(1 Corinthians 15:3-8 NIV) For what I received I passed on to you as of first importance : that Christ died for our sins according to the Scriptures, {4} that he was buried, that he was raised on the third day according to the Scriptures, {5} and that he appeared to Peter, and then to the Twelve. {6} After that, he appeared to more than five hundred of the brothers at the same time, most of whom are still living, though some have fallen asleep. {7} Then he appeared to James, then to all the apostles, {8} and last of all he appeared to me also, as to one abnormally born.

The Ark was an engineering marvel. Models of it have been tested and it's been found to be remarkably stable.