It should definitely just start with modding, I mean who wants to pay double what a gun is worth just to put in COT when you can do it yourself for just parts. The parts you just found lying on the street as you were walking around minding your own business as usual. Actual crafting would be at around skill level 6 or so, and making new items at around 8 and requiring competency in several fields.Hirelings. Job done. Companions generally feel so false. Perhaps CP2077 will change that.
Crafting still looks tedious to me. Perhaps differentiating between crafting and modding existing gear?
Also I don't want you to be able to produce the super kryptonite atom smasher kill-o-matic, nothing that is a game breaker or over incentivizes crafting. So that if you decide that you want to specialize elsewhere you do not feel penalized. Who needs the BFG when you have a dozen street toughs willing to kill for your favor, and a sniper that can drill you a new cloaca right between the eyes from a mile off will make you dead before you even know to activate your super weapon.
Like most of the other discussions about options, I want it to be in the game and if you don't want to invest the IP into tech skills then don't, there should be tons of NPCs that will do it for you, ya just gotta pay for it.