Hey Kevin...slowly but surely! I must admit, I haven't had as much time lately to devote, but I've also been lazy! I found a product at Wal-Mart called Silicone-be-Gone (or something like that), and it seems to really help to get the silicone residue off, with the help of a little more elbow grease of course.

Have you started your project? Would you still be able to help me drill some holes? That's where I'm stuck ultimately!

Excellent, thanks! I am very nervous to have 100G blow out all over the floor of my fourth-floor condominium. I imagine three floors of angry people below. I've heard from many people that height is the determining factor, but there's always that nagging doubt.

Drew no problem on drilling the holes. I have a 1.5" d-bit hole saw and I am about 13 of 15 for the good. 20 gallons I found to be the trickiest but the thicker the glass the easier. Drilling a 33 is no problem.

My own project will be starting as soon as I come up with 4 20 gallon tanks. I already have 2 pieces of 1/4" 24x24 for the bottom. So I am going for 24x24x16h 40 gallons and will make an extra one possibly for sale. I haven't determine how I will drill it out whether in the middle or on one back side, I was going to see what you did and how it worked out. You jump first Drew!!! LOL
Kevin

Update: I've inquired at several glass places, and for a 3' x 3' piece of 1/2" glass (for the bottom), it will cost about $250! Not really in my ballpark right now. On to some possible solutions.

What about using 3/4" plywood for the bottom of the tank? I've read many articles/threads regarding DIY plywood tanks, but I've never seen anyone just use plywood for the bottom piece. As I understand it, silicone will bond glass to enamel, but not bare wood. Obviously, it would never be just raw wood. But if I were to prepare the piece with the appropriate 2-part epoxy, etc., would anyone see any problems with doing this? Why or why not?

actually, no, i do not see a problem with this. GL with your idea, just be careful with some epoxies, as they may degrade easily when you have aquarium life sitting on top of them, and mix into the water.

Fibre glass may be an option as you can get an incredibly strong peice of wood with a good coating. *experience*

Drew.
Why not do a wood/glass combination. See if you can buy just the glass for a 33 here http://go.to/interamerican and use 3/4" wood and the 2 side pieces glued to the wood 18" + 18" = your 36" hence a bottom for your sides. Now your using strictly silicone for adherence. Not sure if it would work but now your looking at around 50$.
Kevin