Left panel: ejecta-shell interaction region from model W15-IIb-sh-MHD+dec-rl-hr at an age of 1117 years, analogous to Fig. 1. The heavily perturbed 3D structure of the shocked shell is also separately displayed as a green volumetric rendering in the upper right corner of the panel. Sampled magnetic field lines are included within a limited region to illustrate the complexity of the magnetic field topology. See Movie 1 available online for an animation of these data. A navigable 3D graphic of the remnant structure as well as of the magnetic field configuration in this phase is available at https://skfb.ly/pt7wt. Right panels: similar to Fig. 5, these panels display the shocked shell (top) and shocked ejecta (bottom) derived from model W15-IIb-sh-MHD+dec-rl-hr at the same evolutionary stage.