Using VBScript to change background color in Excel chart

I'm using VBScript to create a line scatter plot from columns of data in Excel 2003. It comes out fine, but I want to edit some of the properties of the chart, such as background color and axis labels. I did this manually in Excel and recorded a macro, which gave me the following VBA code:

ActiveChart.PlotArea.Select
With Selection.Border
    .ColorIndex = 16
    .Weight = xlThin
    .LineStyle = xlContinuous
End With
With Selection.Interior
    .ColorIndex = 2
    .PatternColorIndex = 1
    .Pattern = xlSolid
End With
ActiveChart.Axes(xlCategory).Select
With Selection.TickLabels
    .ReadingOrder = xlContext
    .Orientation = 45
End With
ActiveChart.Axes(xlValue).AxisTitle.Select
With Selection
    .HorizontalAlignment = xlCenter
    .VerticalAlignment = xlCenter
    .ReadingOrder = xlContext
    .Orientation = xlHorizontal
End With
ActiveChart.ChartArea.Select
End Sub

This looks fine for VBA, but I'm having trouble converting it to VBScript. How should I get started? This is my code at the moment:

Set objChart = objExcel.Charts.Add()
With objExcel.ActiveChart
    .ChartType = xlXYScatterLinesNoMarkers
    .SeriesCollection(1).Interior.Color = RGB(255, 0, 0)
    .HasTitle = True
    .ChartTitle.Text = "usage"
    .Axes(xlCategory, xlPrimary).HasTitle = True
    .Axes(xlCategory, xlPrimary).AxisTitle.Characters.Text = "Time"
    .Axes(xlValue, xlPrimary).HasTitle = True
    .Axes(xlValue, xlPrimary).AxisTitle.Characters.Text = "units"
    .HasLegend = False
    .SetSourceData objWorksheet.Range("E1","F"& LastRow), xlColumns
    .SetSourceData objWorksheet.Range("E1:F200"), xlColumns
End With

The line .SeriesCollection(1).Interior.Color = RGB(255, 0, 0) causes an error: "Unable to set the color property of the Interior class". I'm guessing I shouldn't call .SeriesCollection right under .Activechart. Any suggestions? At this point I'd just be happy to be able to change the background color of the chart to white, and rotate the x-axis labels 45 degrees.

Thank you in advance.