In my previous D6 game, my character was an explosives expert - well, a self taught one with loads of demolition skill. He regularly would whip up batches of Bathtub Gin (AKA crafting his own improvised explosives and grenades). Did we spend any time on it, actually working through the process of making bombs? Nope. He'd occasionally go out for supplies, and would say "I'm making another batch of boom! Who wants some - oh, and don't flush the toilet for about 3 hours." and that was about the extent of it.
Same thing here - hell, the triumphs and despairs and failures of the skullduggery roll would support the flavor of the crafting. But to go "Well, you need some blastech vapor, protion nitrate, a packet of X-13 and a brass tub to mix it all. Go out and get it" and then building a game around getting the vapor, the nitrate, the X-13 and tub would be astoundingly boring.
Just handwave it and be done with it.