A UBO Variable Rail  is constructed in a captive gable method, meaning that the gables are sitting on top of the bottom (see front view below), this method helps to distribute the weight evenly through the legs. 

As standard the UBO Variable Rail comes with 4 legs, back scribe and 2 variable height panels. The UBO also comes with packers, 6 x 3mm and 2 x 33mm.

 For instructions on modifying this cabinet please see below.