So you can do either of those; if you want to request it, on the main forum page, it lists all of the different boards, and some of those have the word "Requests", which means that each of those boards is specifically for requests in each one's specific category; in this particular case, you would want to do "Model Requests"; however, these boards aren't necessarily looked at all that much, so, although I encourage you to try requesting first, if nobody answers, I'll gladly walk you through how to do it. The first thing to do is to download this program here
called BrawlBox, preferably a later version. Go ahead and either respond here or PM me(That little squarish button on the left, if you hover over it, should say "Personal Message(Online)" or "Personal Message(Offline)"; in either case, you can use that to "PM" somebody(It's basically like an email) at any time) when you've finished downloading it and placing it somewhere where you'll know where it is. Keep in mind that this one program can be used for editing models, for importing models from other games(Though this requires other programs as well), for importing edited textures, making new movesets, and so much more, so this is your "go-to" program for making mods.