Yes, I think you got just as much as what I know or can find there myself. I haven't tried anything other than the GSA-5163D case which isn't sold separately. Both cases use Prolific chipset so I think it'd be fine for any internal GSA-4163B. Is Bytecc ME-340U2 the one that has both IEEE 1394a and USB 2.0? If not, try something that has Prolific PL-3507 or at least better chipset. It'd be best if both IEEE 1394 and USB 2.0 connection worked well for 16x P-CAV recording with no noticeable difference from internal ICH4/5/6 connections.
BTW, this post is also somewhat redundant because external enclosures that work well with BenQ or Lite-On or NEC work well with LG equally as well unless there is something very peculiar with LG which is very unlikely.