Welcome to Subsim, Eric.
TheBerbster ( Peter ) would be more than happy and willing to answer any questions you have, with regards to SH4
https://www.subsim.com/radioroom/member.php?u=303079
^ ( TheBerbster's direct link here on Subsim. )
Send him a message and I'm sure he can help you.
I hope you enjoy your time here and once again, welcome aboard.