Hope I'm not too late to the party, I have only just seen this site and my mouth dropped when I saw that someone had figured out how to rip the 3D models! I have been documenting the early Tekken series animations on and off since 2008; there are around 3000 different animations in Tekken 2 alone, despite most characters sharing moves. Note that the animations are everything from moves, to moving around, standing still, laying/rolling on the ground, taking damage, being launched/juggled/thrown, to win/lose animations, and even unused moves which never made the cut. Note that I have only documented (not ripped) the animations by looking at the pointers in the game.
The thing which got me started was not actually the PlayStation version of Tekken 2, but the original Ver. A arcade release which was slightly different to the later versions, having less moves and a few different move notations, some of which were not even documented in FAQs (most FAQs either covered the more common Ver.B arcade machine or the PlayStation version).
Just wondering, would the arcade 3D models be the same as (or similar to) the PlayStation versions? The arcade hardware is basically a custom PS1-based system with Namco's own sound chip replacing the Sony one. I have a feeling the data may be compressed inside the ROMs as even the TIMs don't show up (note that you have to interleave the ROMs first, otherwise everything will be garbled). TIMs do show up inside save states and memory dumps however, as well as on the Tekken 5 disc (tk5data3.bin). Note that the arcade games do not have a visible file system to speak of, so there is no reading through ARC/BNS files unlike the PlayStation games, you would most likely have to read through (and decompress if necessary) the entire ROM data. It may be easier to rip things from the first 3 games from the Tekken 5 PS2 disc, but I don't know if the arcade data is still there or if they are simply PS2 ports of the arcade games reusing the old PS1-style graphics (the sound is definitely redone, mostly using the PS1 sound effects).
While the arcade version of Tekken 2 may (or may not) have identical 3D models to the PlayStation version, the arcade version of Tekken 1 has three unique character models - King's white/red P2 outfit, Law's all-yellow P1 outfit, and Ganryu (all bosses only had P1 outfits). Tekken 3 is also a completely different beast on System 12, with a higher poly count, higher resolution and 3D stages (compared to the flat stage backgrounds in the PlayStation version) - unfortunately you won't find Doctor Boskonovitch, Gon or the Tekken Force guys on the arcade version (Anna is there, although her moves aren't as she was only a Start button costume swap for Nina). The arcade versions of Tekken Tag Tournament, Soul Edge and SoulCalibur may also be similar in design, all three games have 3D backgrounds similar to Tekken 3.