I do not have a pic on me but I have a 10g that was set up this way for some small treefrogs. I'll pop a couple pic tonight and post them tomorrow
The quick and dirty way (3 days set up time, mostly waiting on glue to cure):
-Get a pane of glass cut to 3" shorter than the length, then cut this in half.
-Silicone the lower one into place (I run a bead inside and then go back over the outside seam) and let dry before next step
-Along the inward facing side of the second pane along the edge that will meet up with the affixed pane, run a length of masking tape. Place the loose pane on top of the affixed pane and tape together (basically you are creating a hinge with the tape.)
-Fold the loose pane up so it is now resting in the recess.
-Run lengths of masking tape 1/2" above and below the seam where the two panes meet (if your masking tape from the above step is on the outside you messed up, flip the loose pane over
-Place a nickle on each end of both pieces of tape.
-Run a very generous bead of silicon over the seam. And I do mean generous, you are going to want enough to cover the entire 1" section of exposed glass between the tape strips.)
-Wrap a heavy book/board/flat something in foil
-Smear a strip of vasaline on the foil.
-Set your wrapped flat something down so that the nickles act as spacers keeping it above the glass. You want to "flatten" the silicon bead
-Let dry with flat somthing in place
-Remove flat something (the vasiline should make this easy.
-Remove maskin tape from outside.
-You should now have a silicon hinge.
-Fold loose pane back and remove tape from inside.
-For the 3" gap you have at the top, use screen frame and screen to make a little screen window (I can talk you through that too if you need.)
-Silicone screen into place.
-Mount a pair of swivle locks on the screen frame, these will lock the loose pane in position.
-Silicone a knob on the top of the loose pane.
-Right tank and set up for inhabitants.
For a bit more involved method you can mount sliding track. I can talk you through that too if you want.
Cheers