Yup u are right, ATI sld continue to include the Air Flow Meter for future users, or maybe install a more accurate one.
i think local DIY-gurus such as I-Aquatic can do a better job cutting the acrylic. . haha. .
End of the day, i have no complaints. Before i got the ATI, the skimmer that impressed me most was Deltec. Judging from the bubbles produced by Bubble Master, its definately as good or better than Deltec.
I used to believe that bigger means better. But its proven that short and wide skimmers are more efficent instead!