You show a lot of promise as a Custom Bionicle creator! I can tell you know the aesthetic very well and can reproduce it in your own parts, which is something I appreciate. If you're looking for measurements, here's the site I use for my parts:
It has a great database of just about everything you need to know, and it hasn't failed me yet! :)
I can't wait to see what you do with these parts. If you're going to sell them though, make sure you're setting some markup for yourself, because you deserve it!