I'm pretty happy with the design at this point, though it's a big leap from a nice design to a finished replica, but for now I'm going to have to leave that as an exercise to the reader.
The handle supports are designed to be held in place using metric flange nuts
Screwed onto the end of these threaded rods
Here is how I would make these parts under ideal circumstances, based on the part name in the assembly.
Carrier This could be machined ABS, but it could also be cast if making multiples. In either case, it should be made Pantone 7417C. The advantage of casting is that the pigment could be incorporated into the plastic itself. It's very hard to paint down inside of holes like the cylindrical spaces that hold the tubes, and incorporating pigment into the resin would avoid that.
Handle support 1 and 2 These parts are identical; you need two per assembly. With the exception of the threaded ends, they should be bead blasted 6061 for a uniform matte finish.
Handle. 6061 smooth finish anodized black.
Vial and vial lid. Clear PMMA highly polished to clear inside and out. 10 lids and 10 vials per assembly.
Here is the downloadable CAD model with all the parametric data in Autodesk Fusion 360 format, which can be used to generate CNC tool paths, etc.
TOS McCoy Sample Carrier v14.f3d (290.8 KB)