[WIP] [WIP] Bath Time
As I'm the only person who has yet played this map, I could really use some testers. HECK! It was a puzzle just creating it!
Ready for a couple comments?
I played through the map and everything seemed to work, although there was some laggy bits when I activated the button in the area with no portal surfaces - no big deal.
The cube plates in both of the button areas don't seem to have a function and I don't know how they would be activated (no portal surfaces and no surface for the funnel). The funnel seems extraneous as well - it served no purpose in my playthrough.
With careful aiming and placement I was able to direct the laser to activate both lamps (plate risers) and then hit the other cube to hit the catcher (door open). Exiting was no problem.
Not sure of your intent:
* Maybe clean it up a bit by getting rid of the cube catchers on the ceilings in the button areas, and the funnel. They didn't serve to misdirect me at all as their uselessness was obvious.
* Maybe delete the funnel or give it a purpose?
Needs more work on the puzzle.... thanks for mapping....
The cube plates are only for the lighting. I didn't want bright white light I wanted the dimmer red light LOL
How'd you manage to exit without the funnel? I was unable to do so, thus I added it.
I'm curious how you activated and re-directed the laser. I'm betting you did it a different way than I designed it, because I don't see how you were able to hit all the targets and get out WITHOUT using the funnel.
Any chance you could provide me with a .dem please? I'm VERY curious what you did. I suspect I've got a few things to fix here. =D
Thanks again for your testing mate!! 
EDIT -- re: laggy bits. not sure quite what you mean, or how (or if) I could fix that.
and "both the button areas" .. um .. there's three (3) actually :S
Who needs funnels when you have portals!
http://www.youtube.com/watch?v=xQGp-kTv4_s&feature=youtu.be
As the creator of this map, I thank you for posting this. Not at ALL how I solved it in-design, but totally works. Requires a? lot more somewhat random portal-ing tho.
I'll see if I can figure out how to make an uploadable walkthru-as-designed.
i LOVE your solution tho!!! There's absolutely no way I could predict all the laser angles that could be achieved here; which is, to me, kinda the fun of it. I kinda created the puzzle as I solved it myself.
also, I see now how the funnel can be not-needed. tho there IS a button to reverse its direction. it's meant? as an elevator, because I personally needed one LOL.
After much struggle trying to get a workable video out of Portal 2 ...
Here is a video demo run of how I designed the chamber to be completed.
I knew there'd be more than one solution, and I'm fine with that. There's clearly things that need doing, but you've got freedom as to how exactly to do them. The way I designed it is more linear (with the lasers) than the other posted video by Lpfreaky90. I like his method as well. 
here's my vid
http://www.youtube.com/watch?v=6im2wlKIqOQ&list=PLy2IdW_lL136fzxDQBJ1KZVpUvKpcYvS7&feature=mh_lolz
Except the laser things and the lack of me using the funnel it's pretty much the same 