So, after the desert skip was found, some people suggested other portals, and eve nthe one from Skull Woods. While Weegeechan already showed that he could clip into it, and that he couldn't t-rod up there, I think there's still a chance that it can work.
First of all, I want to show my theory/hypothesis/whatever you want to call it (not proven, I didn't program the game to know for sure) about how the desert skip works (at least, the "why such a small area to walk" part):
http://imgur.com/VhkFtzpIMG 1 is basically how the desert portal is: ground south, void inside walls, and the portal itself. Since you must be merged when going through portals, there must be some walls inside it as well, drawn in red. If you're merged, you'll activate the Hyrule-Lorule cutscene; but if not, they're just walls.
In gray, we have Link's hitbox, and the position is after you clip inside. Since you're over the walls, there's still ground around it (at the very least, under the walls themselves, but might have some between walls as well, but it's not important).
So, while you're OoB, if you walk slowly back to the "normal" ground, you'll realize the walls will give a little push a bit before your hitbox is completely outside. And that's where the desert portal explanation lies: once you walk a little bit left or right, the opposite wall will push you outside, making you fall OoB. That's why we have so little space to walk.
That explained, let's go back to Skull Woods portal (IMG 2).
First of all, the ground inside the pillar isn't a void probably because it was easier to keep all of it as ground.
Weegeechan said that there was an invisible wall that pushed him to the right. That's explained with the theory as well: once you go a little bit to the right or to the left, you're pushed by the walls.
So, what I want to suggest is what some already suggested before, and I want to go back to it again: after clipping, move directly north without being pushed to either side. Once far enough, use t-rod to see if we can get on top of it (turn before using, like in desert skip?).
I'd want to test myself, but Snapdragons are a bitch to use to clip the portal. Weegeechan said that took him a while to clip as well. I wasn't able to clip it yet.
Edit: OK, so I could clip a few times. This clip is stranger, though, because either we get clipped only on the right side (and very slightly on the left, but end up being pushed back, since we're not clipped far enough), or the left wall is more insistent than the right one. After clipping, doesn't matter if I walk slowly or to the left, I always get pushed to the right, like Weegeechan mentioned.
However, there was one time where I was still in the middle (I think) and using t-rod blocked me. Turning obviously pushed me to the right again, so yeah, that didn't work very well.
So either we find a way to keep in the middle, or find a magic spot on the right side. Neither sounds easy =p
