well what you were going to do with having upright elbows is that your having 2 overflows and that i mean you have an internal and exterior overflow, one overflow to the exterior one then down to the sump, that is as least what it sounds like to me. cutting a weir can weaken the glass because people have done is at a 90 corners instead of rounding it, what i mean is that when you get to your corner of the weir instead of going round and then across then go straight down which with glass you cant do everything needs to be rounded on an inside cut. so you can do a wier yourself but drawing out your wier lines that need to be cut, START with drilling to holes on the corners so that the sides of the hole are touching both lines and then cut the glass down into those drilled holes, then sand or dremel it smooth so that they are perfectly inline incase you couldnt cut the lines straight. stick some eggcrate for a snail guard and there you go a wier cut, make sure you use alot of water as usual with drilling glass. if it doesnt work i can be to blame by the way. but that is how you can make a wier cut on your own. or take it to a store. that way you are only having one overflow or just go with an internal one. hope that helps a little.
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