HDPE / HDPP cannot be conventionally "glued" there are some glues ( uv activated that will but the cost is as much as a hummer lol ) you can thermo weld or mechanically fasten with screws to make a cage / rack screwing you will need a few tools like a router and dado bits to join it for a strong joint or opt for a hot air/gas welder and weld them in this case you would need to use nitrogen to create a hot enough weld to bond the materials
-----
www.cheapcages.com
____
edited sig file 2/8/05