What's the best way to edit Mario's tilemap?

The hex address at $DF40 has extended properties for the small Mario standing victory pose and will add an extension to the left of the "peace" sign along the bottom half of the player. As you have probably seen in your graphics file, it's X-flipped from how it presents in your file. Setting this value to $20 appears to spawn an 8x16 punching hand used when big Mario commands Yoshi to eat in the first frame punches the net door, oh god what's wrong with me today, sorry for edit spamming - if you don't use Big Mario at all, this will make changing it especially easy. You'd just modify tiles 20 and 21 in GFX00.bin to fit the form. Of course, you're now at a 16x16 head plus a 24x16 body, so if you needed it next to the head too, I didn't quite figure out how to do that one yet. Values other than $20 do things ranging from showing swimming feet to turning you into a backwards ? block surrounded by garbage, but $20 is the "cleanest" one I've found so far.

If you do use Big Mario and "normal" Yoshi and this tile is going to show up, and you want to remove the extended property for that eating frame that would be replaced, I could play around and find it since it's very close to this one; it's in the same table. Err no, this might actually be used for some net-climbing stuff. It's been a long time, wow. So, if you DO NOT use net doors, this is 100% problem-free to use.