Could you inject full games with SethBling’s Hex Editor for SMW?

[EddieGames]

Before you say, yes, his video about this was 2 years ago, and you can already inject simple games through lots of spin jumps. But I was just watching it recently, and was wondering: Could you inject games into SMW with the hex editor? And I don’t mean just the simple games, I mean like bigger games. NES and GB games. Would it be possible, even if you were to cut lots of code out of it?