INTRODUCTION:
This is going to be a very time consuming, resource requiring, grindy process, due to the fact that you are making /GUNS/
Initally, cargo will recieve a additional tab on their computer titled "Gunsmithing" which will allow them to order different machines, tools, blueprints, attachments, augments, and configurations to make a firearm in a limitless combination of shape, size, weight, fire rate, power, and quality.
Your First Crate
The crate at the top of the list, named "Shop Assembly Crate" will contain 2 computer boards, and a micro screwdriver, aswell as a book titled "Gunsmithing; And you!" which will link to a wiki page explaining the process of making guns, ect ect.
The Contents
The first computer board will be for a CNC Machine, where all the parts for the gun will be made.
This is a basic sprite for it (Subject to change):

The Second computer board will be for the CNC control console, which will need to be linked to a CNC machine (Ideally, these should be right next to eachother)
This is the basic sprite for it:

The Micro Screwdriver will be used to take apart, and put back together gun parts
Basic Sprite (It is supposed to be micro, not much room for detail):

Ordering Guns
Every crate will contain a disk, that you would insert into the console, in order to lathe parts for the gun (Via CNC Machine)
Once the disk is in, click on the CNC machine, and it will open a window, showing you all the parts of the gun, and what you need to make each one.
Click on one (or the select all button) to add them to the que.
The CNC machine will individually print all the parts for the gun.
Gun Assembly
NOTE: Before i get into adding guns that arent already in the game, its best we figure out the parts for all the ones that already are in the game
NOTE 2.0: There will be a blueprint ( Piece of paper titled "Blueprint: -gun name- ) that shows step by step instructions on assembling the gun
For example, lets say you got blueprints for the detectives revolver, and CNC'd all the parts.
-NOTE: I dont have all the sprites for the gun being made, i will begin work on those in my free time if this is added)-
Here would be all the parts for the revolver:
38. Cylinder
38. Frame
38. Barrel
38. Trigger Assembly
38. Iron Sights
38. Grip
38. Hammer
Gun being put together (All the parts that get put on, would be individual pieces that you would need to slide on, then use the micro screwdriver on the entire assembly)

Example of Modification:
Lets say the detective wanted cargo to suit his gun up, by refurbishing it with tactical furniture.
Lets say he wanted a Polymer grip, A 357 Barrel, and a Docter™ Optic

In order to construct it, you would go in this order
Trigger Assembly Onto the frame, Microscrewdriver (MS), Hammer onto the frame, MS, Grip onto the frame, MS, Cylinder onto the frame, MS, Iron sights onto the Frame, MS. Once that is all put together, a detectives revolver would come out.
NOTE: You are able to put the finished gun on the CNC machine to change its description (Serial Number, Manufactuer, Model Number, Gun name)
Summary
I can make sprites for guns being put together (Revolver with the grip and barrel off, Cylinder in, ect ect) I intend to make all the sprites for the guns in the game before making more guns, that arent in the game already.
NOTE: I have not the slightest idea how to code, if any coders would be willing to help me out, that would be much obliged.
Post your Ideas down below.
GIFS OF GUNS BEING CONSTRUCTED WILL BE POSTED ONE BY ONE BELOW
Stetchkin:
Grip Onto Frame, MS, Trigger Assembly onto Frame, MS, Internal Hammer onto Frame, MS, Barrel Assembly, MS, Slide, MS, Iron Sights, MS - Completed Stetchkin

C20-r:
Trigger Assembly onto Frame, MS, Trigger Assembly Cover onto Frame, Blowback Piston onto Frame, MS, Piston Cover onto Frame, Optic onto frame, MS, Magazine into gun. Completed.

Double Barreled Shotgun:
Trigger Assembly Onto Frame, MS, Stock onto Frame, MS, Barrels onto frame, MS, Grip onto Frame, MS, Shoulder Strap onto Frame, MS - Completed

Pulse Rifle:
Power Pack to Frame, MS, Barrel Onto Frame, MS, Trigger Assembly Onto Frame, MS, Pulse Emitter to Frame, MS, Stock to Frame, MS, Grip to frame, MS, Iron Sights to Frame, MS - Completed

NOTE: You will be able to take the Pulse emitter and mix it with other non energy weapons to create limitless ammounts of types and choices for weapons
Pulse C20-r
(Made from using pulse parts from tazers/pulse rifles)

The buttstock becomes the powerpack from the Pulse rifle, The gas piston system becomes the pulse emitter, And normal 12mm magazines are replaced with 12mm Pulse magazines, which are essentially just batteries. The pulse magazine comes from MSing it, then inserting a battery ( Of any type, Higher the charge, the more the ammo, Each shot is 2k in charge )