You can made this expansion board using cheap and ready-to-use LED module like this $1.5 item
For schematic diagram and printed board drawing please visit project page at EasyEDA
Also you can download the python program (file matrixtest.zip attached to project) as small sample how to to use SPI python module with MAX7219 integral led driver. For more clear understanding how it work refer to datasheet of MAX7219.
Important hardware notice: Omega2 CLK line very sensitive for outside parasitic capacitance, so special "1-line bus buffer" integral circuit used for this outgoing signal. Without this smal IC your Omega2 may work very unstable - remember this issue for your future projects!