This page was last updated for Stormworks v1.3.19 (Jan 10, 2022).
Building mode (AKA the workbench editor) can be accessed by using a workbench.
Workbenches may be located near docks, hangars, and train stations. Workbenches at different locations have different sizes for their available construction area. In career mode, it's typical to earn money and use it to purchase larger islands to gain access to larger construction spaces.
Note that blocks are 0.25 meters long, so size measurements for construction areas given in meters are just 1/4 the number of blocks that can be fit into the space.
The current workbench construction areas are as follows:
Medium Dock (longest for now) 56.75x21.75x19.75 m (Creative Base, Multiplayer Base, Harbour Base, Mainland Dock, Arctic Island Base, Custom Base Large Boat and Custom Base Submarine)
Medium Hangar (widest for now) 34.25x35.75x9.25 m (Creative Base, Military Base, Mainland Airstrip and Arctic Island Base)
Small Dock 14.25x6.75x6.75 m (Starter Base and Custom Base Small Boat)
Small Hangar 17.75x15.75x5.25 m (Helicopter Base and Airstrip Base)
Train Depot 24.25x4.25x5.25 m (Mainland Dock, Keys Dock and Arctic Island Stations)
Note that the Custom Base islands also have workbenches for designing structures which can be placed when editing a mission.
Symmetry modes are availabe in the top right of the screen in the workbench editor. These allow for symmetry across one of three planes, and the planes can be adjusted using the move widget.
To see inside of large vehicles, section planes can be used to show the vehicle as if it were cut in half. Like the mirroring planes, a move widget is available to adjust the position.
Vehicles can be colored within the build editor. Default colors are provided, though custom colors can be created and used with the large circle at the bottom of the color selection panel.
Note that 'additive' paint mode does not blend its color with an existing color - it will simply replace the color on blocks without special features. However, blocks with special features, like indicator lights, paintable indicators, buttons, and instrument panels can have the color they produce when lit up set using 'additive' paint mode.
The selection grid can be used to cut, copy and paste parts of a vehicle. It can also import other vehicles, allowing players to design and optimize subcomponents which can then be used across multiple vehicles.