First time poster long time awareness of the awsome site except one thing i seriously don't understand and that is, why not super mario brothers 3 editing forum? Since the site made room for Yoshi's Island(SMW2/SMB4) and Super Mario 64(smb6,smw3,sm64). Since super mario brothers has been remade in 16bit in Allstars, that and SMB3 includes the OVERWORLD part that SMB2 and SMB1 didn't have.
It's probably because there isn't an editor for SMAS, at least not a completed one (though I did make one level with just ASM once). I think people have also said that they don't see the point when you can just replicate a lot of SMAS in SMW (which I disagree with, but whatever).
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I'm working on a hack! Check it out here. Progress: 64/95 levels.