SimpleConstruction uses a different resource chain, however.
EL has:
MetalOre, LFO -> Metal (smelter)
Metal-> RocketParts, ScrapMetal (workshop)
ScrapMetal, LFO -> Metal (smelter)
Sandcastle has:
MetalOre, LiquidFuel -> Metal (smelter)
Metal -> RocketParts, ScrapMetal
ScrapMetal -> Metal (smelter)
SimpleConstruction has:
Ore -> Metal (ISRU)
Metal -> RocketParts (science labs)