structure of the bot

sir,
i want know about structure of the i-bot as iam finding difficulty in making it. i want that the i-bot should move upwards in a ladder which has 20cm space between them. it is quite long iam confused about the structure i dont know whether iam going to make it in a book like structure or something else.................
plz reply me as soon as possible..

This is an iBot. Is that what you're using?
**broken link removed**

I think theres one thats a two wheel, microcontroller based development platform. but its actually a ι(iota)-bot. Still dont see how it could be made to climb a ladder though. I mean you could, but it would be a whole other robot by the time you were done, not a mod to the ι-Bot

Edit, on second thought its not an iota but a script i, like you use to indicate an imaginary number.