I completely reworked how the layering is done so the transparency looks much better now. It is set to 50% (as shown in the picture) but you can increase how much black shows through by reducing the color alpha number and vice versa.
I've noticed that between this version
and this one
, some things were modified to make them "look better", which makes the latest version less faithful to its source.
Wouldn't it be possible to set the original front layer's render properties to "Multiply", so that the raster scan doesn't have to be replaced?