Glass tanks with external overflows

[Harleyguy]

I am in the process of building my 120"x60"x36" monster and I wanted the tank in glass. I also want an external overflow that is the length of the back (but it could be a little smaller). I have had several quotes from several venders; most want to use Euro bracing and cross bracing, but there is one vender that wants to do an open top with a steal frame support. I like the idea of the open top, but he doesn't know how to do an external overflow with this type of top. Heck I'm not even sure how we would do an external with Euro bracing.

I would love to see some pictures of your glass tanks with external overflows. And if anyone has any suggestions please do tell