Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Plastics are easy to cut and glue together, but are soft enough to flex.
If you have the basic container, but need to use plastic for the dividers, you might get by with thinner material, but if you are using the plastic to make the box then you need to use a thicker material, and proper workmanship to ensure it will be water proof. A minor leak in the interior dividers is not a big deal.
Each type of 'plastic' will need the correct 'glue'. Actually, the glue is more of a solvent, and melts the plastic in a very small area and then the parts will weld together.
To cut flat sheets of plastic to size, then cut notches to direct water flow you can use hand tools such as a hack saw, or small power tools, such as a Dremel or other small power saw with a fine tooth blade. Usually these blades will be labeled for plastic, and will work for all forms of 'plastic'. Holes can be drilled with any wood working drill bits. Go slow when cutting or drilling with power tools. The plastic can heat up and melt.