stylesheet file structure

[Kieren MacMillan]

Hello all,

Now that my huge “Home for the Holidays” project is over, I’m hoping to get 
back to codifying my Lilypond stylesheets (including the Henle piano 
stylesheet). When the whole system is ready to share, I want to have a 
sufficiently granular structure, but not overdo it — any comments on the 
following would be appreciated.

Right now, I’m considering the following “tree” levels (presented here upside 
down):

    Size
    Geometry
    Purpose
    Genre
    Instrument
    Style

So, for example, I might have a “leaf” called

    legal_landscape_part_classical_organ_Barenreiter.ly

which would be used to duplicate Barenreiter’s pipe organ scores; or

    letter_portrait_score_musicals_pianovocal_Boosey.ly

to duplicate Boosey’s music theatre piano-vocal scores.

Thoughts?
Is this granular enough? (n.b. I could easily be convinced to conflate Size and 
Geometry)
Or are there levels I’m not including here, which would add flexibility without 
adding too much “overhead" to the system?

Thanks,
Kieren.