I have two videos if anyone is still planning one of these.
http://www.youtube.com/watch?v=n3BGl3v3tts
This one is an IL of 1-1 using Starman and Penguin suit. The penguin suit seems to be as fast or just slightly slower then the starman when you first start out, and conserves momentum from hills when jumping. I don't know how much I slow down because my jumps weren't all perfect but even off the ice if you jump the first possible frame you can probably keep starman speeds just using the penguin suit through most levels.
http://www.youtube.com/watch?v=qcXd4hcd9PY
This video is my current record for any%. From Mario control to Bowser's switch it is 25:31. I had a shaky start but ended fine. I'm re-working parts of world 8 for my improvement since I found a trick in 8-2 my top time there has increased from 817 to 822. I believe it is impossible to skip the plant in world 5 without dying or having passed it already. The vines have a set pattern and the plant moves when you go into its area. If you can find a way to manipulate it into a skip I'd love to see though.
There are more things on my channel, currently I'm working on an improvement to my any% cannonless and working on a set of videos for IL runs through the levels. For 100% I have a 2-6 video that gets all the star coins while skipping the platforms.
Also as a side note I'm pretty sure you can do wall-jumps like in old SMB games I'll need to check my recordings but I think I got a few on camera.