The Makers are nothing more than lists.
You start with a basic item, like a rifle. That will give you basic stats about the weapon: TL, Range, Mass, QREBS, Hit Type, and Damage.
When you move to the next table, you can decide to alter the weapon give the choices on the new table.
For example, if we wanted an assault rifle, then some or all of the weapon's stats will be altered. TL goes up. Range goes down. Mass goes down. Extra damage types added, and so on.
Each table you go to gives you new choices about the weapon, and if you select a choice, stats are altered.
When you get done with all of the tables, you've made it through the maker, and you have a new weapon, complete with stats.