“The need for a mechitza is so the men don’t see the women by davening, right? Or is the issur that women aren’t allowed to be seen davening? So if there is a mechitza, but one that the men could see right through and/or over then is one allowed to daven there? Is a women? Is a man? “
Actually it is a machloket poskim. Rav Henkin z’tz’l, Rav Soloveitchik z’tz’l, and Rav Moshe Feinstein z’tz’l did not hold the above opinion; rather they held that the need for a mechitzah was to create a separate halachic domain for women (which would allow a mechitzah to be much lower). You should consult your local Orthodox rabbi as to whether you can daven in a beit knesset in which the mechitzah is according to the opinion he does not follow.
You might be interested to know that the oldest synagogue in America is an Orthodox congregation in which the mechitzah in their small beit knesset is barely waist high. Their main beit knesset does not have a mechitzah at all; women sit in the balcony where they can see the men very easily — and men can see women as well. Given the number of beautiful old classic halachic synagogues in Europe with that kind of architecture (which inspired similar synagogues all over America), it is difficult to argue that it is an absolute halachic prohibition for men to be able to see women during the service.