The Version command is missing from the C folder.
You should check Startup-Sequence and copy all commands used to the C folder.
Also you don't need the T folder and mfm.device, but you need "AmigaOS ROM Update" in Devs, otherwise the CD drive will not be recognised by the IDE controller.
And you should delete user-startup, it only works with your HDD and will give error messages when used on the A4000.
Do you have the contents of the OS3.9 CD somewhere on your HDD ? Then simply copy the contents of the Emergency-Disk (not Emergency-Boot) folder to the floppy and create that CD0 icon afterwards.
Bye,
Thomas