I had the same idea. I actually just got it working. My goal was to make the pieces slide into place and not require any drilling or screwing to hold the pieces in place.  There was a bit of trial and error getting the piece to line up and seat correctly.

Very cool..

To ensure that the rods where aligned properly, I measured from the outside of the case to the center of the rod, just at the top of the bearing. Both sides were the same. This told me that the print bed was centered nicely in the case. I then positioned the rods so that tops and bottoms were equal to the measurements I just took. This should put the rods in the correct alignment. I then took measurements of the rod ends relative to the front and side edges of the case and used this info to construct the top and bottom rod retainers.

I have not put this up on thingiverse yet. I am not done tweaking it. The top retainers have a little wiggle in them that I am not happy with. I quick fix would be to add some double back tape and stick them to to case, but I would like to try and get a more snug fit. I am shooting for a print-and-snap-together solution.

I had the same idea. I actually just got it working. My goal was to make the pieces slide into place and not require any drilling or screwing to hold the pieces in place.  There was a bit of trial and error getting the piece to line up and seat correctly.

love this idea.  it's along the lines of what i was thinking would work.
Do you have the design on thingiverse?
how did you manage the alignment of the front rods to the back rods?

http://www.soliforum.com/post/33687/#p33687

They have attached roller wheels that go up and down the edge sides.

It seems to me a great solution.