Create a Mech
Follow these steps to build your starting Mech in the Mech Workshop.
Gain Scrap
You start with 20 Tech 1 Scrap. You will use this Scrap to craft your first Mech. This is built out of a Tech 1 Mech Chassis and any number of Tech 1 Systems and Modules installed on the Mech Chassis.
Any spare Scrap you have after this can be stored in your Union Crawler and be used later on in the game.
Craft your Mech Chassis
Craft a Tech 1 Mech Chassis of your choice from the Mech Chassis Blueprints list. This costs an amount of Tech 1 Scrap equal to its Salvage Value as per the normal crafting rules. For example, a Mule has a Salvage Value of 7 so would cost 7 Tech 1 Scrap to craft.
Note down your Mech's statistics
Your Mech has a set of statistics unique to its Chassis. This includes its Structure Points, Heat Capacity, Energy Points, System Slots, Module Slots, Salvage Value, Type, and Chassis Ability.
Note these down on your Mech Sheet.
Craft your Systems
You now craft Tech 1 Systems from the System Blueprints list to install on your Mech. Each System costs its Salvage Value in Tech 1 Scrap to craft, as per the normal crafting rules. For example, a Locomotion System has a Salvage Value of 2, so costs 2 Tech 1 Scrap to craft. A Mech can only install as many Systems as it has System slots. Note these down on your Mech Sheet.
Craft your Modules
Next, you may craft Tech 1 Modules from the Module Blueprints list to install on your Mech. Each Module costs its Salvage Value in Tech 1 Scrap to craft, as per the normal crafting rules. For example, a Comms Module has a Salvage Value of 1, so costs 1 Tech 1 Scrap to craft. A Mech can only install as many Modules as it has Module Slots. Note these down on your Mech Sheet.
Choose your Quirk
In addition to the Systems and Modules you have installed in your Mech, you can also give it a unique Quirk that will make it stand out from other Mechs. For example, their comms and sensor array could look like rabbit ears or they might make beeping noises when being operated. Either roll on the Quirks Table below or create one yourself.
Describe your Mech's Appearance
Describe the appearance of your Mech. The Mech Chassis is simply an example of the Mech in its stock form before a salvager gets their hands on it. Your Mech can take on any appearance that you can imagine.
Give your Mech a Pattern Name
Finally give your Mech a unique pattern name that marks it as your own creation. This could be something like 'Butcher', 'Slinky', 'Bullseye', or 'Roach'. For example: if you built a Mule with Zoom Optics and a Red Laser, you might want to call it a 'Bullseye Pattern Mule'.
Source: Salvage Union Workshop Manual, p. 94