Ok so after everything was cut and sanded we layed it back out to check things over. At this point we looked at all our edges and if we had any bad spots we tried to make sure they were on the top edge of the tank that the flange would be glued to since this is and unimportant seam that won't need to be water tight. We marked all the pieces and figured out how the box was going to fit together. This is kind of an important step since some pieces are cut short to account for the thickness of the acrylic on each side and we didn't wanna glue things together wrong.
So it was time for the first seam. Make sure you have another set of hands around because they really come in handy especially if your new to this like we were. We uses the "pins method" as suggested by marc's site. He has a link on there to a detailed description of how to do this. We used a high E guitar string instead of pins. I highly suggest you take a couple practice runs on some scraps before you jump in. The glue is water thin and difficult to deal with some times. We uses #3 weld on but if you can find it i would go for #4 which dries slower and might make things a little easier. Only take off as much of the brown paper as you need to make the seam so the rest is protected from scratches and glue drips (which there were many of). We used a pair of scissors to cut it back so it didn't get in the way of the squares when we started gluing.
I had my brother hold the piece steady while i glued and pulled out that guitar strings. Then he would make sure it was square while i checked the pieces were flush with each other and looked over the seam for any large bubbles.
Since these are the sides you need to really be careful that the pieces are flush on bottom because this is where you need to glue the bottom of the tank on and a gap would make this seam much harder to do and more likely to leak. When i was saying earlier that i would cut all the sides without moving the guide fence on the table saw, this is where that comes into play. Our pieces were off by maybe 1/32 or so but is made the bottom seam a little annoying to get right. We glued the two short sides on first like this and let them dry for a while before adding the last side.
