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You may replace the nRF24l01 with Bluetooth module like HC-05.It is easy to change the code as Arduino has the library.
I am using this library.https://github.com/nRF24/RF24
Cut the D12 and D13 pins from Arduino Nano
you may try this https://www.thingiverse.com/thing:1358552
Simple RC Mecanum Wheels Robot Wif Arduino View Instructable »
Using the plastic dip is a good idea!Do the rollers roll well? It would be nice if there is video showing how the wheel rolls
Spiderbot V2 - Robot CarView Instructable »
Cheap OBD2 communications on K-line (ISO 9141-2 and ISO 14230-4)
Super Cheap 3D Printer from CD-Rom Drives