>>What is a "Menards"?
Menards is a midwest home improvement center. If you don't live in the midwest you probably don't have one. You can just use regular melamine coated particle board and then glue real wood moulding to the cut edges for a nice, finished look.
>>And I still don't know how to build it.
You won't find any exact plans on the web. You can find several sources that you can modify for your own needs.
I build my racks very similar to what is show at arbreptiles.com
However, I use spacers similar to what you see at Finegtps.com
In either case you'll need to modify the plans for your needs.
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Current snakes:
1.1 Gonyosoma oxycephala - (Silver/Yellow)
2.2 Gonyosoma oxycephala - (Green)
4.3 Gonyosoma janseni - (Black)