These are the structures I've noted from mods I use that seem like they could be reorganized.
[Liquid Structures]
- Flow Control pipes would fit above normal pipes or valves. Perhaps a contingency with Flow Control for Bobs pipes that instead gives each added pipe type its own row, to compensate for added material variants.
- Valves from Bob's Logistics mod and Flow Control. The basic Bob's Valve already has its own row for the others to join.
- Pumps and 'Storage Tank All Corners' from Bob's Logistics mod
- Manifold Pumps to join the others.
- 4 Way Underground Pipes - I am unsure where this could be sorted to. Perhaps with valves?
[Vehicles]
- Rampant Arsenal advanced and nuclear locomotives, cars and tanks.
- Would it not make sense to move train structures row to be above the trains themselves?
[Storage]
- Standard Boxes could go into the second tab to meet with other storage options, for consistency sake.
- Angel's Addons - Warehouses and Void Chest are already categorized with the basic storage options, so could go with them.
[Production]
- SPM Steel Double Furance, Double Furnace, and Crazy's Double Electric Furances row would fit just under the normal furnaces.
- Tier 2 and 3 Nuclear Reactors and Heat Pipes from Bob's Power mod are separate from their counterparts.
- Centrifuges are a factory but merged with power generators, and their tier 2 and 3 counterparts from Bob's Assembling machines mod are separated.
- Hiladdar's Research MK2 and MK3 labs to join normal and module labs.
- Reverse Factory could be its own row, although T1 and 2 are already alongside Bob's electronics assemblers.
[Icons and Structures Lacking Color]
- 0.18 electric drills from Bob's Mining mod are missing color tiers.
- Fluid Burning Boilers and Nuclear Reactors from Bob's Power mod are missing color tiers.
- Centrifuges from Bob's Assembling machines mod are missing color tiers.
Hopefully all that was clear, and sounds reasonable.
I didn't look at the military tab as it's a bit of a clusterfuck thanks to the mods I have installed.
Your mods are fantastic and I very much appreciate you for them. =]