I may have missed something, but how do you change the LDCad file format to one that can be used by the instruction building / publishing software?
OR - is there one that uses the LDR file direct?
Thanx
Ed
I think you're looking for
LPub3D. With that, you can use LDraw files to create instructions.
And LDCad saves files in the normal LDraw format, so they are 100% compatible

If you mean the generated parts those can be handled by adding some LPub meta's around their references so LPub knows to handle them as alternative part instances.
That way pictures of the official (static) part will show in the part lists etc.