An industrial grade, field-usable Mobile Work Station, comprising a rolling cabinet having lockable internal storage, which is fitted with precision-adjustable, tubular rails on one or more sides to which special compound clamp-vice assemblies may be mounted at a plurality of locations to engagingly retain work pieces and hand and power tools, and which includes tool holders and an under-chassis rack for retaining a battery to power tools. An exemplary MWS is shown in which the X, Y and Z axes of pipe rails may be micro-adjusted to be in precise orthogonal relationship so that precision work may be accomplished in the field, even where the surface is not level. Leveling jacks are provided at one end of the cabinet to permit precise horizontal leveling of the cabinet pipe rails in both X and Y axes. Power tools include saws, grinders, welding spinners, benders, vices, anvils, drills, and the like.