SR2 Designer:
Here is the SR2 Designer and my ideas about what things are.
Lets start with the left panel
Left part.
Top left: some sort of menu to upload and save rockets?
Next one down
Tools*
Next one and so on
Add parts?
Part properties?
Idk some numbers thingy
Mirror tool
Views.
*within the tools button:
(Top to bottom)
Part selector? Maybe like multi select?
Obviously fine tuner
Rotation tool or radial mirroring
Paint DUH
Resize?
Also you can see the play button in the top right and the undo button on the right.
the undo button on the right
TrIGgErEd
As well as the cost and weight at the bottom.
__
I hope these guesses are right,
I have a feeling mechanics and gameplay are going to have a lot of similarities to SP, so the adjustment should be relatively quick. The hassle will just be going from using drunk plane science to drunk rocket science.