Here’s a preliminary schema of LMTX. What do you think?

Is there something important missing?
Maybe add mtxrun, hyphenation patterns, modules. Move the images to the 
resources?
Maybe I should replace the “files” within MkXL with the parts like 
parser, par builder and whatever?
I don’t want to complicate it needlessly.

I’ll redraw it in MetaPost (with proper typography) if I’m sure enough.

Hraban