As a cross-reference, mines for SH3 (not SH4) have been released as part of the UbA Mod. Although this is not SH4, I know that there are many modders who are familiar with both, so I am just mentioning this, in case it helps. The link is http://www.subsim.com/radioroom/showthread.php?t=147445 and the mod download is available from there.

Thanks to Darkfish I have a fully working mine mod for my Kaidai 3b.

Keltos