At long last, I have High Sierra installed on HP8200 and this post is typed with it running.
I am happy
because this is my very first 'semi-working' hackintosh.
Thanks trs96 for the detailed steps and the rest who posted various fixes that helped me come to this stage.
The issue I suspect gave me the earlier error either my downloading of HS was corrupted or the I did not follow properly on the steps to 'assemble the HS files via command lines. I also took out DVD cables and another HDD cable to simplify troubleshooting, I shall put back the DVD cable and second HDD cable and see what happen after reboot.
also, for knowledge purpose I shall also tried the first hard disk that fail to install.
I have not run Multibeast yet.
For a quick test, I shutdown and restart.
1. Restart OK, surely have to boot from the "install macOS High Sierra" USB stick.
2. Ethernet OK else cannot send this post.
3. No sound, I think expected
4. Cannot sleep, unlike the El Capitan which can put it to sleep and wake it.
Going to read a bit more on how to run Multibeast and make proper selection so that I can have sound, sleep and so on.
Any help is highly appreciated on what to look out for on running and setting up with Multibeast.