Ok another update, hopefully by tommorow I should be caught up to where I'm currently at (Maybe tonight before bed if I have time). So after testing drilling the practice piece of glass I moved on to the real tank. I also wasn't sure if this bit would work for cutting glass , but as you can see it did
So I set up the template again to start the hole. That piece of metal is solid steel and ways something like 25lbs. It was to hold the template in place. The bottom of the tank is elevated from the ground with wood so the glass has some support on the back.
Here I am drilling away.
And both holes were a success

Still a lot of water/glass bits all over though.
And here are some pictures of the bulkheads installed with the tank on the stand. Yes one of the holes in the stand is a bit off and yes those teeth marks in the paint are from the hole saw owning me :P (Stuipd pilot bit wasn't in tight enough). The holes in the stand are 2 1/2" to give some room.