Where do Y'shuah's Apostles rebuke Paul? I reply that the best place to look would be in the writings of John. John had a special place among the Apostles. John's Epistles would be written late enough that confronting Paul is a possibility. (As an aside, Acts is not the best place to look at the positive side of the interaction between Paul and the Apostles, because it is written by one of Paul's followers.)

1Jo 1:1 That which was from the beginning, which we have heard, which we have seen with our eyes, which we have looked upon, and our hands have handled, of the Word of life;

Gal 1:11 But I certify you, brethren, that the gospel which was preached of me is not after man.

Gal 1:17 Neither went I up to Jerusalem to them which were apostles before me; but I went into Arabia, and returned again unto Damascus.

2Co 12:1 It is not expedient for me doubtless to glory. I will come to visions and revelations of the Lord.

John begins with a statement that his relationship was with a flesh and blood Messiah who he heard and followed. Why is this critical?

Paul boasted about NOT getting his gospel from the Apostles. He went to Arabia and had visions.

1Jo 1:10 If we say that we have not sinned, we make him a liar, and his word is not in us.

Phi 3:6 Concerning zeal, persecuting the church; touching the righteousness which is in the law, blameless.

I have never figured out how Paul could be obeying all the commandments at the same time he was persecuting the early believers.

1Jo 2:18 Little children, it is the last time: and as ye have heard that antichrist shall come, even now are there many antichrists; whereby we know that it is the last time.

1Jo 2:19 They went out from us, but they were not of us; for if they had been of us, they would [no doubt] have continued with us: but [they went out], that they might be made manifest that they were not all of us.

John is speaking of antichrists as people who "went out from us, but were not of us."  Paul had a relationship with the Apostles. Okay, this is were you START to look for an antichrist.

1Jo 4:1 Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world.
1Jo 4:2 Hereby know ye the Spirit of God: Every spirit that confesseth that Jesus Christ is come in the flesh is of God:
1Jo 4:3 And every spirit that confesseth not that Jesus Christ is come in the flesh is not of God: and this is that [spirit] of antichrist, whereof ye have heard that it should come; and even now already is it in the world.
John also talked about love. I believe that when Paul said that anyone who had a different gospel was accursed, that he was actually cursing the Apostles. This is not love.

Rom 8:3 For what the law could not do, in that it was weak through the flesh, God sending his own Son in the likeness of sinful flesh, and for sin, condemned sin in the flesh:

Phi 2:7 But made himself of no reputation, and took upon him the form of a servant, and was made in the likeness of men:

Paul preached a Jesus who "came in the likeness of sinful flesh." The flesh of the Messiah John knew was just the same as John's flesh. This may seem like a minor point, but church historians see it as very significant.  Marcion accepted Paul over the Twelve and clearly taught docetism.

http://www.jesuswordsonly.com/Free/ch13.pdf

We are commanded to "try the spirits." This includes Paul's!

1Jo 4:7 Beloved, let us love one another: for love is of God; and every one that loveth is born of God, and knoweth God.

Gal 1:8 But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed.
Gal 1:9 As we said before, so say I now again, If any [man] preach any other gospel unto you than that ye have received, let him be accursed.

Rev 14:6 And I saw another angel fly in the midst of heaven, having the everlasting gospel to preach unto them that dwell on the earth, and to every nation, and kindred, and tongue, and people,

John said love.  Paul said "let him be accursed."  What if Paul's gospel was not the same gospel that had been preached before by Y'shua?  What if Paul's gospel is not "the everlasting gospel" that John referred to in Revelation?