I bought some cheap readi-board from the dollar store to make dividers in a drawer at home.  I whipped these up to hold the board in place and they worked great.    

You'll just have to modify the Z height in the slicer to get your desired length.

Readi-board (foam board) Dividers

4-Way.stl

Simple low-poly mockup of the Keyestudio Mega Plus board.  While the mockup is very simple, the measurements   are quite accurate. 

Keyestudio MEGA 2560 Mockup

This is just a straight forward mockup of the Sainsmart 16 Channel Board.  I needed to design a custom box for one, but couldn't find a model to use, so I made one.  Hopefully someone else can use it as well for their projects.

16-Channel Relay Board Mockup

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Readi-board (foam board) Dividers

Keyestudio MEGA 2560 Mockup

16-Channel Relay Board Mockup