TL;DR
The rocket silo should have a circuit option to output current rocket build percentage, optionally the secondary rocket as well.


What?
Image mock-up, rocket build progress could be output to the circuit network (likely as a user-controlled signal, like assemblers and roboports).
Shown as ...

Reproduction Steps:
Create a situation with two underground belts of the same type beside another object that blocks belt placement (Tested: Lamp, Rail, Different colour undergrounds) as seen in screenshot #1.
Place or Ghost place belts of the same colour as the undergrounds through the ...

understandable, though this is all without un-researching the technology or removing the mod its from. the only changes are with other unrelated mods.

Reproduction Steps:
Load into a save with a mod using the give-item technology effect (I've used Speedstart by Sarahtoma)
Research a technology with the give-item technology effect
Save and exit the save
Add or remove a mod with a technology (I've added Text Plates by Earendel in my testing ...

Reproduction Steps:
Load into a save with a mod using the give-item technology effect (I've used Speedstart by Sarahtoma)
Open the technology menu and select a technology with the give-item effect
Click on a give-item effect
What did you do?
Clicked the give-item effect displayed on a ...