Merge 2 or several scripts panel into one single panel

Actually you can make it even if you don't have access to the resource.

Use Window.find() to get the window,then loop in it to get its children and event handlers as JSON-format data or anything like that.Finally you can import that data to the new Window and bind all the event such as 'onClick' to the origin control of origin Window.The problem is that if the two scripts are jsxbin,you should not to close them in order to keep the merged script validate

It's def a lot of work, what I would do is standardize the layouts of each to be as simple and standard across each script.

Then rewrite per script. 

addGroupMyScript() - build group that contains all the code for UI and execution of that script [all functionality contained here.]

Then building a new palette, execute each function in the sequence you need.

You would at least have a system then to build individual script palettes and easily integrate them into a multi part palette.

No, you cannot do it that way.

You really need to have access to the code of each individual script, understand how they build their UI (they might use different techniques) and merge them into one UI. Will definitely be lots of work.