Wow, that's a lot of input to sift through
I probably shouldve given more details about their vocal anatomy; though the Uudra have no tongue, they have a second pair of mandibles in its place to swalllow food, the rest of their basic mouth structure is similar to ours, possesing lips, teeth and gums, an alveolar ridge, a palatte, a uvula, a pharynx and a larynx. With the secondary manbibles, or "inferior mandibles", they can be used to constrict air at points of the alveolus, the lateral, the uvula, and the pharynx. Their movment can be a single plosive movement off of these surfaces (known as clicks), or a rapid vibration against the surfaces (known as chirrs). But the lack of a malleable structure such as a tongue denies them the capability of producing differing vowels. They can simultaneously "voice" by vibrating their glottis at differing speeds to produce the glottal tones.
I looked up insect communication and learned that insects dont "vocate" since they dont have a respiratory system like our own that allows us to vocate. Instead some "stridulate" (rubing body parts together), or in the case of cicadas, have a organs called "timbals" - I like the idea of timbals, but I dont know how I can add that to the already developed Uudra physiology :S
As for creating IPA symbols for alien sounds, the whole idea of my use of IPA symbols was to help understand the vocal structure and sounds the Uudra possess. The Uudran writing would be considered as their IPA.
As for the rest, I'll have to go over in more detail...