Hi Navigator857
Good luck with the mods you try
It might be worth you keeping an eye on FOTRS Ultimate
http://www.subsim.com/radioroom/showthread.php?t=226270
You don't have to read all 82 pages!
Just read the last 4 or 5 and you will see the sort of progress we are making
Still in development, but close to a General Beta release
It looks awesome
(Of course I am a biased, seeing as I am helping them

)
The great thing about it is - it seems to satisfy what you listed in your original post
Complete graphics and environment overhaul - check

Complete overhaul of the sub interiors, they look absolutely beautiful -check

Complete sound overhaul - check

Will have 5 different plugin mods so you can choose your level of enemy AI and therefore the difficulty of the game - check
Also not on your list but important nevertheless - pretty much doubles (or more!) the amount of ships in campaign
Japanese merchant ships have gone up from 15 to 37
IJN units have gone up from about 25-30, to 58
Just imagine all those extra targets you can sink
Keep an eye on it
FOTRS Ultimate - coming soon
Hey Rockin Robins - you wanna pipe up here and do your sales pitch on Navigator857
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Authority should derive from the consent of the governed, not from the threat of force
If the only tool you have is a hammer, pretty soon everything starts to look like a nail
FOTRS Ultimate
http://www.subsim.com/radioroom/showthread.php?t=226270
The future of SH4 - coming to a PC near you soon