Good way is create script files (*.scr and script command in autocad), which could be used for generation of DWG/DXF files.
I could prepare some DWG files. 

But i don't understand testing system for it. 
@rurban could you help me with it?

How to test pre12 DWG files?
This is a GitHub Issue
repo:libredwg
owner:LibreDWG
Title : How to test pre12 DWG files?
Issue date:

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Good way is create script files (*.scr and script command in autocad), which could be used for generation of DWG/DXF files.
I could prepare some DWG files. 

But i don't understand testing system for it. 
@rurban could you help me with it?

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