If you have trouble with the areas around the glue joint turning white, or "clouding", use Weld-on 4 instead of 3. It's made to avoid that.
Quoted from loppydog:
I remember the first time I worked with acrylic. With my CO2 laser I cut out a nice full sized template with long skinny vertical cut-outs. The thing looked great when I was finished. Came back the next day and it looked like someone smashed it with a hammer. It was shattered into a million pieces. This stuff cracks REALLY easy.
I seem to have much better luck cutting Lexan, but I am sure that is way more money though.
Same thing happens if you flame polish edges with a torch. The heat creates stresses in the acrylic which can be released by the solvent cement, or even changes in ambient temperature. The only way around this is to anneal the parts, which is a long process of heating the whole part to an even temperature, and gradually cooling. See here:
Neat project. Best of luck.