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3 rooms

DISCLAIMER:
Read my profile before reading the rest of my comment!

Listen to Jaydog1032. Didn't need to fling. I can carry the cube from the second area to the turret area. "Portal bumping" (Google it) is possible with the glass that encases the turrets and the fizzler in the final area.

Try my SP map?
http://www.cs2bus.com/sharedfiles/filedetails?id=398483361
Try my COOP map?
http://www.cs2bus.com/sharedfiles/filedetails?id=376181211

This is some feedback that you may need to consider when making a map:
1. I only needed 2 cubes that's all.
2. Try not to soak all the chambers you build in white because in the first test chamber I found that I didn't need to use the bounce gel or the drop because I could reach the top easy. Tip use emancipation grills or don't have portalable surfaces at all in a place where you don't want them to go before something is done first.
3. Revise the size of the test chmabers. Try not to make the tester walk around because that can be boring.
4. Light your chambers clearly using the light strips or small observation rooms.
Other than that I think this has a lot of potential. Check out some of my maps in my workshop under "collection" and play some from there.
But keep on going mate!

nice:)