On the last trip we found ourselves always needing a quick and easy access area to store readily available stuff like some snacks etc, we also found that our drink flasks didn't fit in conventional cup holders. One of the main designs of the interior of this truck is that we wanted to be able to have passengers in the rear seating area but also have a flat platform for our dog to be on with access left or right sides as well as someone to be able to lay down on either while driving or just taking a quick nap. I found that most of our drink flasks are the same outside diameter and fit nicely inside a piece of 3" pvc pipe.. This also allows us to be able to put a regular drink in there and not have to worry about the condensation ruining the cup holder..
I took a coupling piece and cut off a small section of the ends and this gave me a flange to secure to the wood, capped the bottom and glued it all together.. I used marine 5200 to secure the holders to the wood. This allows our drink flasks to sit completely down and they are very secure and don't interfere with the opening of the tuffy box, easily accessed from the front seats.i even wrapped a bit of sound and heat insulation mat around them that I have laying around.
Behind the cup holder will be a hinged lid that lifts up to cover that storage area, this also houses the Webasto diesel cabin heater air outlet, so in cold climates we can remove the cup holders and the heat comes out through that area..when travelling it provides an extra area to quickly put things like cameras etc to help minimize the threat of smash and grab break ins..