I am currently looking into making my own motorized bicycle, however, before I get too caught up with all the details, I want to speak to my local police (Lemont, a chicago suburb) and figure out what the legality is for them. I read through the thread titled "Illinois" and got the gist of it, although I got lost when they started throwing in the bills. But here is what I will be asking/argueing when i speak with them:

Is a motorized bike legal for public street use?
Do you consider a motorized bike a moped?
If yes: How do i register, title, and insure it? I herd that you cant since there isn't a VIN number
If no: Is it considered a power assisted bicycle, which means there isnt any need to get anything special for it since it is a bicycle, or is it considered a motorcycle?

I thought that was going to be a longer list. Please, help me come up with questions to ask. Thanks everyone.