Thanks for the heads up Zovs.
Still working my way through putting them all together.
The 19px overlap between tiles is annoying, but almost sorted.
Once I have a completed low-level map, I'm going to import it into inkscape and draw a vector map.
Then import out as .bmp, and slice and dice back in GIMP.
Very interested to see where this all leads.
Were the graphic errors significant? (I have yet to arrange all the tiles.)
(Also noticed we're the same age. I guess good graphics still count for some folks).