Check out non-project mode and tcl based flow. It takes more up front work but once you have it scripted out, you can build from nothing but tcl files and sourc

Check out non-project mode and tcl based flow. It takes more up front work but once you have it scripted out, you can build from nothing but tcl files and source files. Even with block designs and IP files. All of it is replaceable by human readable tcl files.