About the best thing you can do to make the IIc+ portable would be to add a Playstation LCD screen to it, like I did with my original IIc. You can see pictures of it here: http://blackfletch.freeservers.com/appleIIc.htm

I need to add some more pictures I've taken that show the back of the LCD and where the power and composite video from the IIc plug into it.

Magnus