The CBB

I don't want to be switched. Hope that's okay.

This looks very cool. I think for the consonants, you have several options. You could go for something Kordofanian, like Moro , which has height harmony. I think something Hungarian-like would also fit, since the geographically close Romanian has similar diphthongs. I would also love to see this com...

I guess I'm in, sounds fun

Okay, just a quick comment on the discussion. As I suggested in my first comment this is allomorphy, i.e. it is not derivable by general regular phonological rules, as Sal correctly pointed out. This means that the rules that Sangi describes have to be morpheme specific, i.e. only apply to the plura...

If you google "english plural suffix allomorphy" you should get at least three different possible solutions.

This client should be in the resource section.

Many languages have no voiced fricatives at all. Having no voiced fricatives and still having voiceless fricatives is very common.

/m n/<m n>
/b t d k ʔ/<b t d k q>
/f v ð s z ʃ x ɣ ʕ h/<p f v s z ß x g c h>
/ɮ/<j>
/l j w/<l y w>
/r/<r>

/i iː u uː a aː/<i í u ú a á>


Next:
/i iː u uː/
/e eː ə o oː/
/a aː/

/m n/
/p t k/
/tʼ kʼ/
/b d/
/tʰ kʰ/
/bʱ dʱ/
/s h/
/l j/

/m mʲ mˠ mʷ nʲ nˠ nʷ ŋ ŋʷ ɴ ɴʷ/<m my m' mw ny n' nw ng ngw nq nqw> /p pʲ pˠ pʷ b t tʲ tˠ d dʲ c ɟ k kʷ ɡ ɡʷ q qʷ ɢ ɢʷ/<p py p' pw b t ty t' ky gy k kw g gw q qw gg ggw> /tsʲ dzʲ tɕ dʑʲ/<tsy dzy tc tj> /sʲ zʲ ɕ ʑ ç ʝ/<sy zy c j hy v> /lʲ lˠ~ɫ lʷ ɫʷ j ɰ w/<ly l' lw lw' y ' w> /r rʲ rˠ rʷ/<r ry r' rw> ...

Just wanted to mention that I am following this and I really enjoy the diachronic detail in this project.

Looks very okay, it's basically a standard 5 vowel system plus back rounded vowels. I think some phonologists would use the IPA symbols for centrals vowels instead, but that does not really make a difference, I guess.

/m n ŋ/<m n ng> /p b t t͈ d tʃ dʒ k k͈ ɡ q/<p b th t d c j kh k g q> /ᵐb ⁿd ˡd/<mb nd ld> /st ks/<st ks> /β f v θ s s͈ z ʃ h/<bh f v dh s sh z ch h> /l j ʎ w/<l y ly w> /r/<r> /i iˑ u uˑ uː uːː/<i í u ú uu úú> /e ɛ̃ o/<e en o> /a ɑ̃/<a an> /m̩ n̩ r̩/<im in ir> /a˧ a˦ a˨˦ a˨/<a a' ax' ax> Next: /p b ...

/m n ɳ ɴ/<m n rn q> /p t ʈ q/<p t rt k> /b d ɖ ɢ/<b d rd g> /mb nd ɳɖ ɴɢ/<mb nd rnd ng > /ɸ s ʂ χ/<f s rs h> /ʙ r ɽr ʀ/<v r z x> /bʙ dr ɖɽr ɢʀ/<bv dr dz gx> /mbʙ ndr ɳɖɽr ɴɢʀ/<mv nr nz nx> /l j w/<l y w> /i u/<i u> /æ ɒ/<e o> /eɛ oɔ/<ea oa> /ɛɪ ɔʊ/<ei ou> Next: /m mˀ n̥ n nˀ ŋ̊ ŋ/ /p b t d k g q ɢ/ ...

/p p̪ t̼ t̪͆ t t̻ ʈ ȶ c k q ʔ/ <p pl tm tl t tn tr tj kj k kr kl> /ɸ f θ̼ θ s s̻ ʂ ɕ ç x χ h/<f fl sm sl s sn sr sj hj h hr hl> /i̝ i ɪ ɨ u u̝/<i e y v w u> /a o/<a o> Tones: /a˩ a˨ a˦ a˥/<à a á ä> /a˩˨ a˩˥ a˨˦ a˧˩ a˦˥/ <àa àä aä áà áä> /a˩ ˥ ˦ a˨ ˩ ˦ a˨ ˥ ˦ a˥ ˩ ˨ a˥ ˩ ˦/<àäá (a)àá (a)äá äà(a) äàá>...

/m n ŋ/<m n g>
/p t k ʔ/<p t c q>
/ɹ ɭ j w h/<r l y w h>

/i u/<i u>
/a/<a>

/◌∅ ◌˥ ◌˩ ◌˩˥ ◌˥˩ ◌˩˧ ◌˧˩/<a ak av ad ab af az>

Next:
/m n ɲ ŋ ɴ/
/mb b p nd d t ndʒ dʒ tʃ g k q/
/ɓ ɗ/
/β ɸ f v s z ʃ ʒ x ɣ χ/
/mʙ ʙ̥ ndr r~l r̥/
/ʋ j w/

/i u/
/ɪ ʊ/
/e o/
/e̞ o̞/
/ɛ ɔ/
/æ ɐ/
/a ɑ/

/m n ŋ/<m n nn> /p b t d k g ʔ/<p b t d k g q> /f v s z x ɣ h/<f v s z x gg h> /ʦ ʣ/<ss zz> /l j ɰ w/<l y rr w> /ɾ/<dd> /r/<r> /Cʲ/<Cj> /i y ʊ u/ <i ü ù u> /e ø ə o/<e ö ì o> /ɛ ʌ ɔ/ <è à ò> /a ɒ/<ä a> /Vː/<VV> Next: Consonants /m n/ /mb b p nd d t g k kp gb q/ /pf ts~c kx/ /f v s z x h/ /l r j w/ V...

Next: /m n/<m nn> /p b t tʰ d k kʰ/<p b tt th dd kk kh> /ts tʂ/<ss xx> /v θ s z ʃ ʒ ʂ ʐ ʐː x h/<ff t s d c j x z zz k h> /l lː ɻ ɻː j w/<l ll v vv y w> /r rː/<r rr> /i y ɨ ɯ u/<ii üü ïï uu> /e ə ɤ o/<ee öö ëë oo> /a/<a> /ej aj aw ow/<ey ay aw ow> /◌̆ ◌̃ ◌˞ /<a an af> /◌˦ ◌˨ ◌˦˨ ◌∅/<á à â a> Next: /m...

I really enjoy this family and its Papuan style.

/m n l̃ ɲ ŋ ŋʷ/<m nl nc nk nq> /pʰ tʰ tɬʰ tɕʰ kʰ kʷʰ/<p t tl c k q> /pʼ tʼ tɬʼ tɕʼ kʼ kʷʼ/<pp tt ttl cc kk qq> /b d dɮ dʑ ɡ ɡʷ/<b d dl j g gq> /f s ɬ ɕ x xʷ/<f s lh ch kh qh> /ʋ ɹ l j ɰ w/<v r l j x w> /i ɯ u/<i ui u> /ɛ ʌ ɔ/<e eo o> /a ɑ ɒ/<ae a ao > /ia̯ uɒ̯/<ia ua> /ɑj ɑw/<ai au> Next: Consonants...

Just wanted to mention that for some languages the different dimensions (length, creaky voice, nasality) are independent, so you get combinations of these. But others don't, so it's up to you.