@rivaan really, I imagined engineers to come in with a host of pre made weapons and inventions, such as a tricked out pistol or something. Engineers can buy spare parts from the general store, which can be used to repair any and all machinery including the mysterious contraptions you may discover in dungeons.
@Crazytazer you might want to make a list of 3-4 inventions you've already made, although in your spare time feel free to make any new ones you see fit. For the "crafting system" in this RP, most of the basic weapons can be made just by using spare parts, but the upgrades and legenderay items will require specific items you can find around dungeons. I hope that explains everything you need to know.
On another note, I will be taking a week long vacation and will be absent for 5-6 days. In the meantime, crazytazer and the fated fallen can finish there posts. Thanks for understanding!