my trader, zero, and yes you can find it if you work hard at that, but not near enough. the entire reason you split crafting the way you did was to not force players to go intel. so you gave them schematics to make things if they find em. all well and good, but still. having steel be at int 10, perk 5... forces players to go intel still to have enough mats, UNLESS they are lucky enough to get the drop.
I am not saying you should remove it, just drop from advanced engineering 5 to say 3. thats more a blacksmith issue than engineering anyways. you have more worthwhile things at 4 and 5 to justify the value of getting to 4 and 5 for straight int players