Thanks Hajime! yes, after we released it we thought to ourselves that the entire collection of materials being consumed in a single craft was an unnecessary penalty. However, the original reason we made that decision was to provide a benefit to not salvaging all the scrap the player had collected (If there was no benefit, salvaging scrap would just be an annoying, click-heavy step in the crafting process!). I think with better user feedback and prompts, the system could have worked quiet nicely.
I'm glad you enjoyed our game and caught the crafting bug! Congratulations on your golden magnet, magnate!