[zubi]

Excellent work, and indeed it sounds pretty much neutral. One question though: I always thought Esperanto pronunciation and letters map quite one-to-one with Turkish, have you considered basing your work on Turkish instead of Polish?

Except ŭ, Esperanto vowels have exactly the same sound as they do in Turkish. Among the consonants, ĥ and c don't map, but all others do. Even ĉ, ŝ, ĝ and ĵ map to one specific letter with the identical sound.