So you reusing old interface as new interface?

I kinda like that, it looks nicer and cleaner than the current one on 4.6.
It seems like you still using Swing, have you consider porting to JavaFX?
No it's only an old screenshot

It looks cleaner and nicer because there were only some parameters and basic functions. Less info, less configuration for the user.
When you start adding parameters you need to reorganize GUI.
About JavaFX, i consider it in 2013, but i haven't found any reason to use it. Swing is ok for what i need
I never saw the old version, can't believe it just so simple back in the day

I thought you reorganize everything to make it looks cleaner.
As a Java developer myself I can definitely see the appeal of using Swing but JavaFX would definitely give the CAT more professional looking, in my opinion.
It just a thought anyway.