I think it is wrong dependence beween "Machine Construction III" -> "Laser II". May be better change it to "Machine Construction II" -> "Laser II" to avoid technology level mismatch.
Also suspicious dependence is "Silicon Nitride" -> "Semiconductors II", becouse that branch doesn't use any recipies from Silicon Nitride, but uses Carbon Tetrofluoride from "Organics 3" (but no dependence). Btw, anybody know purpose of recipe "VLSI Wafer" from "Semiconductors II"?