Hi, I made a level called "Walled Off" (which has been attached) There is a vertical wall spanning the entire field and also saparates the armmadillo from the portal. There is also only one place where the wall can be broken, which is the very bottom. (The armmadillo and portal are all the way at the top.)
Unfortunantly I havn't been able to complete it yet, however, I have been able to break though the wall, so it should be a possibility.
(Don't read this if you don't want any hints: To break though the wall, I used two hammers, one on either side of it.)
I'm thinking that once you get the armmadillo to the other side, it should be easy to get up by using several sling shots (rockets are disabled, by the way) or relativly easy to get up, anyway.
Oh, and you can't just slingshot over the wall, there's another wall up there.
If you find a solution, post it, I'd like to see how you get past something like this. (I also need the solution so that I can know what price to have, I also plan on having several levels of wall breaking, this would probbably be the final one. Unless I think of something even harder.)