There is nothing wrong with private interpretation, Lincs. Catholics do not propose that private interpretation of Church history, The Great Gatsby, how to cook sushi, marriage rituals of the Tasaday natives, etc etc etc. is forbidden.
It’s only when you say Private Interpretation is all you need to know what God has revealed where we have a problem.
I’d like to see this list of essentials, and the Bible verses that support it.

I guess your question if effectively something that may be asked in an evangelistic opportunity; “what must I do to be saved?” I can’t give you such a verse, I can present what I would say if asked…
In God’s sovereign work of salvation:
“for all have sinned and fall short of the glory of God,” (Rom 3:23)
"For the wages of sin is death… " (Rom 6:23)
“what must I do to be saved?” (Acts 16:30)
"And they said, “Believe in the Lord Jesus, and you will be saved, you and your household.” (Acts 16:30)
"And Peter said to them, “Repent and be baptized every one of you in the name of Jesus Christ for the forgiveness of your sins, and you will receive the gift of the Holy Spirit.” (Acts 2:38)
"Thomas answered him, “My Lord and my God!” (John 20:28)
“because, if you confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved.” (Rom 10:19)
“And if Christ has not been raised, then our preaching is in vain and your faith is in vain.” (1 Cor 15:15)
“Therefore, since we have been justified by faith, we have peace with God through our Lord Jesus Christ.” (Rom 5:1)
“and hope does not put us to shame, because God’s love has been poured into our hearts through the Holy Spirit who has been given to us.” (Rom 5:5)
“And those whom he predestined he also called, and those whom he called he also justified, and those whom he justified he also glorified.” (Rom 8:30)
“No one who abides in him keeps on sinning; no one who keeps on sinning has either seen him or known him.” (1 John 3:6)
In short, God convicts, man repents, is baptised, believes in the gospel of free grace and justification, he clings fast to the saviours work, daily strives to be conformed to Christ, living with a knowledge of the truth of the Triune God. I would also add of course, that the Ecumeincal creeds, and the Athanasian creed, as accurate witnesses to the scriptures, sum it all up pretty well
I guess to be fair, you would say something pretty similar to the same question; what is essential to you?
Lincs.