Installed Hercules on my server and downloaded MVS 3.8j TK4- OS/VS2 mainframe software and stared messing arround.
I hade a few challenges allong the way, apparently my FreeBSD server doesn't understand the variables in de hercules scripts. But after fixing that able to boot the mainframe.
Next challenge is to customize it a little, so have changed the system ID to DEVI, which means reformating the jes2 spool dasd.
And changing the logon screen which means adjusting the SYS2.CNTL(TK4-LOGO) assembly file and submitting it to rebuild and relink the NETSOL tool.