Here is a case that I have been working on for the Folgertech Delta. I have to replace the electronics on that machine & was originally going to use the arduino, but now I am probably going to use the Rambo mini. I was just looking at changing that to use the mini Rambo yesterday. To use it with the MPCNC, you would just need something screw the back to or it would be simple enough for me to make another optional back plate for it. I was going to upload it after I finished printing all the parts, but if you are interested in this design, I could upload it in the next couple of days after tweaking a little more. I remixed this from a design where I just had the LCD. You did not say which LCD you were using. This uses the 2004 LCD display.
Here is the design with just the LCD display