my glass was all beveled before the build...the bottom piece was several hundred pounds...took 4 of us to get it up one flight of stairs..
let me walk you step by step.
Cut and drill all pieces prior to build. For the overflows use 1/2 inch clear as well as a thinner black glass with the black glued on the outside of the clear.
Set a thin sheet of foam on top of stand and place bottom sheet of glass on top. Line up the tank appropriate to your plans)
now for the sides...first do a thick line along the length of the back piece and have a helper or two to assist in placing the back glass down on it making sure its perfectly aligned.Have them hold in place while you lay your caulk along the side meeting the corner.
Place first side piece down firmly making sure to get a tight seal.
Now do extra caulk inside the tank of all seams...be thoughrow as a spot missed can cause a weak seam.
Place a few clamps to hold the glass firmly and do the exact same steps on the remaining side first and then the front glass...ensure all inner seams are caulked and that whole tank is clamped for both horizontal and vertical bracing
What did you use as a spacer? From what I have seen you must leave space in between the panes, for proper adhesion of the silicone. Wasnt you worried that you would squeeze out all the silicone between the joints when you put on the clamps?
Make sure you Properly caulk the outside joints and then let caulk set...mine took about 4-5 days...
Now is eurobrace time....and overflow installation)
Install the overflows using the same basic procedure.Remember to caulk inside as well as outside)
Euro brace the tank and clamp to set.
4-5 days later...
Add 2 12 inch wide cross braces on top of tank...these can be caulked on top of euro brace where needed..
let set...
Cleanup...
taking razor blades cleanup edges and glass both inside and outside tank...
wash glass and voila!...ready to assemble plumbing)