This author has charted a structure of Paul’s letter to the Colossians in the form of a chiasmus.
His original page is here, with some links. Don’t have much idea of the content in the rest of the site, but I’m studying this.
I. Epistolary and salutation. 1:1,2
II. Reports and messages by Epaphras. 1:3-8
III. Paul’s solicitude for the Colossians, and prayer that they might acknowledge the mystery. 1:9 to 2:7
IV. Doctrinal correction for failure as to Ephesian truth. Having died with Christ. 2:8-23
IV. Doctrinal correction for failure as to Ephesian truth. Having risen with Christ. 3:1 to 4:1
III. Paul’s solicitude for them, and their prayers asked concerning his preaching the mystery. 4:2-6
II. Reports and messages by Tychicus and Onesimus. 4:7-9
I. Epistolary and Salutation. 4:10-18