Added an updated version of the old terrain code generator here. Fixes some problems with the layout, and it should work better when pasting codes of various lengths, as well as when linking and bookmarking, you can go back in your browser to undo:
https://swyter.github.io/mab-tools/terrain#0x1d63c005114300006228000053bf00004eb9
The checkboxes were broken on Firefox, as well as a bunch of other stuff. Now it also validates the format and shows the background in red when you paste something invalid.