My opinion:
- About the acid behaviour (damage, knockback, angle of launch, frame data) you should take a time analyzing the original or ask for data on the SSB64 part of Smashboards so it can be as accurate as possible
- The BG image looks a little off (maybe that's just me, since I haven't played it in a while)
- Will you make a brawlified version?
I don't guess I'm analizing those things, it would be tedious and not really necessary, in the case it's even possible to edit to be totally accurate. It's accurate enough for me, the acid burns, it gets high in a similar way to N64, and the gameplay is pretty similar.
Since the acid I'm using isn't transparent, the background can't be seen entirely. I may be trying other models in the future, but I'm keeping this one right now.
About the brawlified version, like with Kongo64, only the background and lighting will change. I'm not gonna make hi-res textures for the main stage or something.
By the way, it's gonna be working over norfair, but there will be an alternate version for Brinstar. The Brinstar version isn't expected to be perfect because of some collisions I cannot move. I may be moving it up so it works fine enough in Brinstar, but the acid won't reach the stage. So the Brinstar version will not be much recommended unless you want some acid when you fall off the stage, and no acid on it xD
Also, there will be a low-acid version for norfair (it barely reaches the stage), and a FD one. There will be some visible acid, but you won't be able to touch it. And it won't rise, so you will fight the stage just as is, without the acid. Still planning and fixing all those thingies anyway.