Hello and welcome to the support forum.
I am afraid you will need the original CD with AmigaOS files to install the Amikit, the same CD you've used to create the HDF file you mentioned. The AmiKit installer scripts check for the presence of the real CD. Alternatively you can copy the content of the CD to a hardfile named "AmigaOS3.9" and mount it on AmiKit startup. This should work as well.
One of the following source of system files is required:
- AmigaOS 3.9 CD (both editions)
- AmigaOS 3.5 CD
- AmigaOS XL CD (Amithlon)
- Amiga Forever 2005/2006 (available to buy here