Mapping the icons directly to the inworld tiles seems like a good idea - until you consider that the higher detail turns into a smudge. Case examples of this are the refinery, roboport, and electric mining drill. I have mixed feelings towards the battery, laser turret, and robot icons.
ones that I very much support in this pack include the Steel Furnace (thought it could do with a graphical simplification), the various capsules, blue/redprints, and wood.
Consider the at-a-glance value of the icon.
