I used some pictures I found out of Anthonys Omnibot 3000 picture ,since I was at work and its really close to watch im trying to achieve. Here is what I have.

From the look of it. If I cut off the front of the old chest piece to the red line a new 3d printed bezel would hold the tablet and everything would come together. Its the perfect height as the original front piece and not as wide. I dont have the piece I printed off as I didn't let it get to far.

If you open the .stl you have (that was appearing too large) your software should tell you the size in mm. If you note down those measurements then measure the front of the Omnibot you'll know how close the size is to being correct.

@JustinRatliff Thanks for the tip going to try that when I get home!