I recently did a few tests with a piece of HDPE and a blowtorch and noticed a few interesting tidbits:
1. HDPE is extremely heat resistant. My blowtorch gets up to about 1200F and it did minimal damage after ~30 seconds of exposure. The only real effect it had was a minor amount of melting at the point of application. This leads to the second finding:
2. HDPE behaves much like parafin wax in that it melts to a clear liquid then cools back to its original properties (eg. color, hardness, texture) This fact is responsible for the most important finding:
3. HDPE can be heated in one spot and partially melted to allow bending. This means that you can use HDPE to make custom chassis mounts. Here is a picture of a L bracket a made to test the concept:
Theoretically the same idea can be applied to melt the entire piece into a mold and create custom molded parts although I haven't tested this yet.