for anyone who is wondering how to add your own entities, it is pretty easy but you gotta get your hands dirty!

1. go to: C:\Program Files (x86)\Steam\steamapps\workshop\content\4000\2956538698
2. use GWTools or GMPublisher to extract the GMA file
3. open the extracted folder and go to and open with like vscode or something: lua/weapons/weapon_builder
4. in that code copy and paste into the Builder_EntitiesTBL table: [ "EXAMPLE" ] = { cost = COST, Name = "EXAMPLE", PrintName = "NAME", mdl = "MODEL"}
5. replace EXAMPLE with the path to your ent, npc, or anything else (example: "npc_gman")
6. replace NAME with the name of your object (example: "Gman")
7. replace MODEL with the model of your object (example: "models/gman.mdl") -- you can find in spawnmenu/spawnlist and scroll down to addons or whatever folder your model is in
8. replace COST with how many swings you want your object to cost (example: "100")
9. press CTRL + S to save your file
10. exit your code editor and drag and drop your custom sent_builder_swep folder into C:\Program Files (x86)\Steam\steamapps\common\GarrysMod\garrysmod\addons
11. exit gmod and open gmod again
12. go to spawnmenu/weapons/other and your sent swep is there!
(MAKE SURE TO UNINSTALL THIS ADDON SO IT WORKS!!!)

:steamhappy:

just realized the modder has this in the code if it helps anyone!

--[[ -- put this into the entity code you want to become buildable

Builder_AddClass("sent_mysent", {
PrintName = ENT.PrintName,
Name = "sent_mysent", -- our class name
mdl = "models/resident_evil/t-virus_vial_shattered.mdl", -- our in construction model
cost = 25 -- ammount of hammer swings
})

]]