Facet Sizing & Consistent Rect/Bar Width across Facets

[GatsbyFitz]

Hello!
I've created the following nested facet, however, I'm keen to scale the facets so that I have consistent rect width:

Plot.plot({
  width: 960,
  height: 480,
  y: { domain: [3000, 9000], insetTop: 20, labelAnchor: "center" },
  marginLeft: 80,
  color: {
    legend: "ramp",
    range: myCategoricalColors,
    domain: ["2020-21", "2021-22", "2022-23", "2023-24"]
  },
  marginBottom: 90,
  marginTop: 35,
  marks: [
    Plot.axisFx({ anchor: "top" }),
    Plot.frame({ anchor: "top", strokeOpacity: 1 }),
    Plot.dot(
      anz_consumer_data.filter((d) => {
        return (
          d.indicatorID == "DOPED0501/DOPCN0101" &&
          (d.annual_date !== "2018-19" || d.annual_date !== "2019-20")
        );
      }),
      {
        fx: "Jurisdiction", // outer x facet
        y: "value", // shared y scale
        fill: "annual_date",
        render(index, { scales }, _values, { facet, ...dimensions }) {
          const data = Array.from(index, (i) => this.data[i]); // subplot dataset as a subset of the data
          const plot = Plot.plot({
            ...dimensions,
            marginTop: 60,
            ...scales, // shared color scale, shared y scale
            fx: {
              axis: "bottom",
              label: index.fi ? null : undefined,
              tickRotate: 45
            }, // inner x facet, with a label only on the first top-level facet
            x: {
              axis: null,
              tickSize: 0,
              label: "",
              inset: 0,
              type: "band",
              nice: true
            }, // new x scale with a common domain and additional axis options
            y: { ...scales.y, grid: 4, axis: null }, // shared y scale with additional options
            marks: [
              Plot.frame({ anchor: "bottom" }),
              Plot.barY(data, {
                fx: "Network",
                fill: "annual_date",
                x: "annual_date",
                y1: 3000,
                y2: "value",
                tip: true
              })
            ]
          });
          return svg`<g>${plot}`; // faceting requires a <g> element for now, see https://github.com/observablehq/plot/pull/2219
        }
      }
    )
  ]
})

Does anyone have any thoughts on how I might be able to achieve this?