My suggestion is that if you're going to only be growing orchids then keep it simple. No need to make things complicated if you don't have the culture quite right. Fewer variables mean fewer potential mistakes, and much easier troubleshooting.
Having said that, there are lots of amazing build threads on dendroboard.com.
Your most important variables are going to be temperature, air movement, and humidity, and there are tons of ways to tackle each one. Check out others have done and see what is feasible for you.
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