I had a ramp system kind of jury-rigged with some boards and bricks, but mom got all excited and ran out and bought me nice sturdy wire closet shelving and some outdoor carpet to put on top of it, and my brother came over and helped attach everything with brackets and things, and now even the not-so-agile Gandalf can make his way around everywhere. He's still scared of the cat door, although I've found him outside on his own a few times now - I always have to hold it open for him to come back in. I held Bones up to the cat door and held it open to see if she'd be interested, and as expected she was utterly horrified and ran away to her nice safe lurking basement. I locked the cat door while we were switching out the ramps, and in one of the photos Toast is pressing his head against it, very frustrated that he can't get it open to go to his happy fun place, lol.
Still needs some work right around where it meets up with the house to make it raccoon-proof, so raccoon baby has only been out for supervised playtime, but she's all over it like a fish to water, so to speak ^^
Here's some pics - I think I've got the permissions set right: Catio/Raccoonio Flickr album