As far as I know, Gsklee custom drew the source for those minimaps pixel by pixel, by hand. That's a LOT of work. But then he never gave the code to anyone. So when he went away, the code as lost.
Tim rigged up something using SVG and overlays on the dynamic maps that was pretty neat. But it depends on good SVG maps. The ones I created weren't all that good. It was OK for EC, and I think finished AT/BT, but I never did Dwilight.
Weren't you working on SVG maps of the islands? If those were available, then there's a lot Tim could do with them.
