I have an inexpensive and small notebook computer I use in the woods to copy pictures from game cams. I used this to connect to the Pi by WiFi. It’s a nice size screen for control.
I designed up a cover for the Pi for the MPCNC and cut it out of acrylic like the cover I made for the RAMPS. There is no ventilation in the top or sides facing the mill. This is mostly to keep cuttings off the circuit board.
I found an 1/8″ Straight Bit with a single carbide cutting edge at the local hardware store. Its a CMP Contractor Series Straight Bit B1103 Carbide Tipped Z1. This worked better for cutting the acrylic then the double flute bit. I could run the bit speed higher without melting the acrylic.