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Quick question - are any of the resources you make compatible with 2003? Currently that's my major game engine, and I can't quite afford anything better yet, so I wanted to check to see if I can use them there

They should be, because they're based on a 16x16 grid. The tilesets for sure, I've converted some before.
But while they are compatible in general size, you'll need to reconfigure everything to the formats that 2K3 expects, because by default they aren't arranged that way.

Gotcha. Good to know.