Another note to self:
If using 24 bit replacement help graphics, they do work but are very off-center if the dimensions are larger than the original .lmp images (320x200?) like 640x480, for instance.
(the topmost X,Y is where the Quake menu is, as opposed to being centered on-screen).
[I've always thought the standard Quake help was no help at all, and have explored the path of making actual useful help such as telling you how to change your colors, adding a table of Quake colors, common commands, etc. etc. )
add: replacement "quake/gfx" do work, but must be original size. They don't get "resized". (like MoonDrunk's replacement elements for the plaques that say "multiplayer", "quake", "options", etc.)