Hope you don't mind if I ask similar questions?
I'm confused by the project status.
First, is the Wiki page up to date?
Second, is the project finished replacing, say, any one of the original GRF files? I'm not sure what's in which of the original files. For instance, is all of trgi.grf finished or something like that? My original TTD CD has a copy of trgt.grf which OpenTTD complains about (though it seems to run OK), so I wonder about such things...
Third, does anyone know (if nobody knows, that's fine) how much of the 'deficit' of unreplaced material can be easily made up for by installing various people's NewGRF stuff (the ones which *aren't* necessarily designed as playalike replacements, like TTRS, UKRS, Generic Tram & Road Vehicle set)? There seem to be a large number of such projects. Also, what can ignored just by sticking to one climate (and which climate is most complete)?
I'm just wondering what items are left until we can play *some* version of the game without using copyrighted graphics from TTD, even if it's a restricted version of the game with different rules. Judging from the table on the Wiki, it looks like you're not that far off: I guess the main font and the buttons in the GUI are the most crucial projects which haven't been started? If I ever get some free time and it hasn't been done yet, I might take a crack at the font (I'm no artist, but fonts are another matter).