This too hard?
Here's a Paint drawing of how the puzzle is. Please note that each portal must remain to its own section of the chamber. If you get both portals in one part, you'll get stuck (in my map I made a way out, but you must start over that part then. (best to load game))
Paint puzzle:
It's possible, but you really got to think for it.
EDIT: LEGENDA:
Grey lines indicate portable walls. The darker grey stripes on the lower section are stairs. If you fall u wont hit the stairs but u can climb up without the use of portals... think in depth.
I'm making a Paint solution now, and will post it up some time soon.
My question is, is this too hard? And if so, how can I indicate what to do in here? I don't want it completely obvious, but some hinting might be useful...
But the walls between the 2 areas are made of glass in 3D... you can easily see what's next before you get there. Just my friends ignored that advantage of seeing what's to come.
Besides, here's a solution:
You need to do it in a certain time though... you've got yourself an energy pellet waiting for you in that puzzle 
If you said it in your first post, I could have told you straight away that it was easy, and nice job mentioning the energy ball now. Any particular reason you decided to omit it from your diagram. No-one can create a solution if you miss out things like that 
First you get the energy pellet to bounce in that room from one side to another.
Then you do the flinging.
Then you open a portal at the energy pellet again and continue on.
But I'll just see till the Beta of the community map pack before I'm going to edit stuff