If you want, I can check with Sluigi/other team members and possibly send you the character attributes that we have right now. It seems like it would be a decent start for converting the characters. If we've messed up and something seems wrong, having another dedicated modder, even if on a different project, would probably speed up the process of getting a 64 Brawl mod out. Let me know either way.
We have the character attributes down (e.g. jump height, air speed, friction, dash/run). I'm currently working on figuring out knockback values, because a simple conversion of the numbers to hex leaves us with horribly underpowered moves with no reason. I've been working on Pikachu's bair specifically, but also have a proxy of Jigglypuff's rest where it kills at 0% for me to redo when I figure this out. I've been pretty busy since graduation, which is why this part is taking so long to figure out.
I also know that we have a Link reskin to an N64 model done from a while ago. The group handles most of its conversation with calls and doesn't think to use text posts to fill me in after the fact, so I'm pretty out of the loop, especially for being a member, so I couldn't tell you what else we have done. Based on how long ago the link costume was, I'm going to assume we at least have the full color swaps for Link done.
I think we ended up deciding to try and remove side specials after the major backlash from that, but I guess I'd need to double check with the rest of the team. I can get back to you on that, if you'd like. I don't know if we currently know how to remove up/down throws, so it is probably something that we'd keep for initial releases, at the least. New characters aren't on the radar for us right now. The primary goal is to get the original 12 characters working and move from there. I believe that after that, we'd focus on taking some community input towards balancing the characters before adding the others. My copy definitely has a CSS character selection that restricts selections down to the original twelve.
That being said, I'm really not sure what's going on with some of the other aspects of the project. We have a lot of random stages in one of the builds; I think what happened was that after finishing all of the N64 stages the people focusing on adding stages just kept adding other ones. I also remember hearing about Dreamland's platform being moved in the R64 thread and have absolutely no idea why that happened.
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Sorry for making such a long response in a thread not about R64. Like I said at the top of the post, let me know if you'd like any help and I'll see if the rest of the team is okay with me giving you character stats (or just the PAC file directly). I could also ask about the stages from the N64 game, though I'm not sure if the blastzones are entirely finalized.