Summary

large Arduino case with holes for IR receiver and motor speed control (Parts ebay) 38KHz Infrared Receiver IR Sensor Module for Arduino Electronic Robot. DC 1.8V 3V 5V 6V 12V 2A PWM Motor Speed Controller Adjustable Speed Controller. Electronics-Salon 6PCS 3VDC SPST-NO 5A/250V Power Relay Module. DC3V.

(Large Arduino box W-IO switch V2) the Arduino in completely inside the box, also space for 9v battery and hole for I/O switch.
All holes are made for 3mm brass insert with the exception of the battery and switch those are for 2mm brass inserts.
Parts =
Mini Micro Slide Switch - 1p2t 2 Position - 20pcs SPDT Toggle Switch - Panel Mount Small High Knob Vertical for Breadboard PCB Arduino Electronic Board - (SS12F15) 5mm - Dip Miniature Slide Switch

abcGoodefg 8 Pack 9V Battery Holder Plastic Battery Storage Box Case with Lead Wire