[font=courier new]planIcon#[/font] can reference a bigger icon if needed. 128x128 is just the size of the ones computed from a 3D object in the plan.

Specifying a larger value can be also useful for people who want to print the plan or export to SVG with a better resolution. But maybe in those cases, I could try to compute the best size automatically for a 300 dpi resolution for example.