Basically, its done very well.
But it have some very inconvenient moments:
1. UI should select your current island, by default
2. UI should be able to validate a temporary plan, without requirement to create new plan
3. Very inconvenient network grid: i cant see the terrain under my buildings, but the tiny terrain map in the right upper corner. I requesting to add a terrain layer with lets say 0.4 transparency, to know where your buildings are exactly.
3.1 The best idea would be to integrate world map and network connections map, imo.
4. Validation should have longer visualization on a tactical window. Maybe configurable. Maybe permanent, unless you un-check. Or:
5. Collaboration of placement validation and terraforming plans: i want to plan my city, and create a terraforming plan from it, what corp will use to level all land for a city.

__________________________________

6. Summary for building plan: total cost of construction blocks, cost of buildings according to market prices (excluding buildings without sell orders. notify about it somehow)

7. Accumulator consumption info for turrets and other buildings without it

8. Hotkeys: copy, paste, delete

9. Drag-n-drop for multiple selection

10. Information about buffs, what structure can generate (for stealth tower, masker, mining outposts, booster node)

11. Holographic images in a tactical window for a selected plan.

----------------------------------------------------------------------------------------------------------------------------

12. Highlight incoming and outgoing connections for selected buildings