4 channel relay module box

My 4 channel relay box.
I made this box to enclose my 4 ch relay module that is running some of my Christmas lights.
I have a box, a lid, and a shelf.
The box has a hole on the left side for wires.
I have 4 small square holes for the relay LED's.
There are 4 holes on the back side for the relay wires. The holes are only big enough to access the common and normally open contacts.
There is also room for an Arduino Nano inside.

R1 Revision
I bought another 4 ch relay board and noticed