What I've done for this situation (light in the way)...
Removed the hinge, cut the glass down the center. The left side rests on the left side of the tank top, and the center brace, the right side has a modified cabinet pull double sided tape holding it on.
For feeding, dosing, etc...just remove the one side and place it on top of the left side.
But now you have me thinking a bit more.
Might have to venture out to the hobby store again...
Take two brass or aluminum channels, solder them or epoxy them together on the edges of the glass, voila, sliding glass top. I might line the inner channel of the top piece with teflon tape or something else to help with the "slide".
Would look like this:
Depending on the width of you tank, this might just do it.