as the idea of the diagram is to make things 'simple' to grasp then it looks like quite a bit of detail would have to be ignored really.
as for scales being accurate - that could be done by having zoomed in and out views. i had a look through google and i've not seen anything there that looks like what i'm trying to describe.
these are the sorts of things i'm thinking of (as they are easy to relate to).
56k connection - a human hair.
typical domestic broadband - drinking straw.
gigabit - i don't know, maybe a 6 inch diameter pipe.
other stuff i don't know the terms of.
typical connection between isp and 'internet' - pipe with 20 feet diameter.
typical connection between countries - pipe with 1000 feet diameter.
numbers are arbitrary as i haven't a clue.
then, with the general sizes/number/capacities i could put them onto a globe - zoom in and out views with cross sections of pipes within pipes.
any other devices like routers or whatever could be represented in some other quirky form.
perhaps i'll just draw it and ignore the correct scales - then if someone sees it and knows better they can correct me and i'll update it. or i'll just do a really stupid cody version then i can use magic to make it all work.
i guess what i'm aiming at is a colored cody diagram thing not unlike what william heath robinson was so great at http://en.wikipedia..../wiki/Heath_Robinson
well, i can dream can't i.