How can I make 3D TV watchable framepacked files from twin SD (not HD) captures ?

Hi 3D'ers,
I'm using BlackMagic DL HD 3D Extreme, with CS 5.5, and I want to make 3D TV compatible files out of interlaced pal, from twin SD 4X3 cameras, recorded on Digital8 tape. I'm not wanting anaglyph or auto-stereoscopic 3D, but compatible to domestic passive 3D TV's.

Do I really need to acquire/use an extra thing with my setup, like Cineform studio premium or similar; or is there another way. I thought with the gear I've got (above), with all their bells and whistles, (and mentions of 3D), that basic 3D production should be well catered for already.
I've been studying StaxRip for muxing two video streams, but I'm not a tech geek, so learning/understanding it is slow.

Does Media Express or CS5.5 mux videos ? ; is the BM only 3D extreme after you add some extra thing ? Does CS 5.5 do anything useful for 3D, (apart from multi vids on timeline).

Yes I know I'm using old technology, (4x3 SD) but it is digital, so should be useable, although inadequate for today's TVs. I capture/download separately via iLink to CS5.5; sync videos & edit both together on timeline, render separate to BM files; import separate & is watchable as SxS on Media Express, or output to 2 TV's.

Can I shrink (not crop) my 4x3 SD down to match HD pixel density, to aid conversion to HD, (small HD picture with large black pillar borders). The BlackMagic DL HD 3D Extreme only does 3D in HD, not SD.
So far my HD conversions from 4x3 interlaced pal SD: 3DHD HD720p50 LHI=worst-unwatchable; BMHD1080 8 biy yuv 50i= very very bad; BMHD1080 8bit yuv 25p=very bad; not many other options.
If I have to, is ultrastudio 3D, or GoPro CineForm, or some other thing most useful to me ?

Any clarification or advice or recommendation will be appreciated. Sorry about the huge text, but no luck from BM or Prem Pro forums.