Hi,
Oh, your project sounds really exciting (and not just because of your proposed hourly range ;)) and I would really love to work on it! Firstly, I have never done webinars, I have to say that. BUT, I worked as an English teacher (and used some PPTs in my classroom), which also requires a person to be a good presenter :) I am also enthusiastic, which I believe is important for a presenter of any kind.
As for my experience, I've been working mainly as content/article/blog writer here; but, I've also done some audio/video transcription and close captioning, translations, data entry and some WordPress related projects as well.
If you have any questions about me or my work, I'll be happy to answer. In the meantime, kindly consider my bid.
Have a great day!
Isidora