New CBB

I've thought of a light heavy noun system for a conlang to be like basque light-heavy verbs. I'd like to know if you think it is plausible (by light and heavy I mean the light noun carries the grammar and the heavy the meaning.)
Evolution
the proto lang is a heavily tonal language with a noun phrase structure of Head noun- case clitic- modifying nouns/ adjectives. A sample phrase would be mê pë (for a child)
As the language evolves, it loses tone, so the word mê (child) sounds the same as mé (river) and mē (train). Thus, generic nouns like suki (person), lu (machine) or ça (place) become agglutinated to form noun compounds. Because noun phrases consist of a marked head noun and following modifier nouns, the case marker comes after the generic noun that was agglutinated. suki pë me would mean "for the child" but more literally "for the child person", lu pë me would mean "for the train" and ça pë me would mean "for the river"
As evolution furthers, all nouns end up with a generic noun prefixed to them, and the case markers fuse to the generic nouns, resulting in the phrase for the child become skib-me (a contraction of sukipë-me). For the river would be çëb-me (a contraction of çapë-me) and for the train would be lub-me (a contraction of lpë-me).Thus, the language would effectively have a noun class system with the noun class prefixes declining.

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You suggest that the noun class markers evolve from generic head nouns? It sounds very reasonable.
I didn't understand if tone changes played some role in the evolution.


Light and heavy are not terms of general linguistics. Maybe a heavy noun phrase could be a long one.
I would rather call them specifier and generic noun, or something like that.

I suppose simple and generic would be better terms, I didn't know official terminology so I used basque terminology, basque light verbs are verbs like "to have" and "to be" that don't have much meaning on their own and are compounded with something that does.
The tone changes were just a random example of a sound change that would cause obligatory noun compounding to happen.

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