Durable Outer Casing to Prevent Fall-apart

I've decided to renew my work on the densitometer, so I've ordered several components and, in the mean time, decided to work on constructing the casing.

The case is made entirely from pieces of fiberglass, cut with a dremel tool, and glued together with 5 minute epoxy. 

The mostly completed densitometer exterior.  While some of the refinements, such sanding the arm into a more ergonomically pleasing shape and carefully painting the exterior, may seem trivial, I think they are important because they require a certain level of attention to detail and precision that also contribute to mechanical functioning of the apparatus, which will ultimately improve the repeatability of the density readings.  Just a note for anyone interested in sanding or cutting fiberglass: you will feel much healthier afterwards if you wear a respirator while working rather than a mask.  A mask is better than nothing, but it doesn't create the seal needed at the edge of the mask to give you full protection.  Also, do it outside.