T7RNAp information page.

[1] 3D computer model of T7RNAp in elongation phase. Found on Davidson's website.

[2] Structure of T7 RNA polymerase complexed to the transcriptional inhibitor T7 lysozyme

[3] Structural characterization of T7 RNAp

[4] Structure of Transcribing T7 RNAp. If you scroll down the page you find structural diagrams of T7 RNA in the initiation, intermediate, and elongation complexes.