Welcome to BYC. I was an avid bull riding fan back when Troy Dunn was riding - not so much now. Even went to several PBR events. Your wife is right. The time for sharks, skydiving, and bull riding is over for me. 

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Hello and welcome to BYC!Glad you joined.
The coop you have will never accommodate 18-20 chickens! Those pre-fabs never house as many birds as the information provided for them claims. At most, you could comfortably fit 10 LF chickens in it and that would be tight if you have any conflicting personalities.
If you are not in a rush and have any building skills at all, you might want to consider building your own coop or even modifying a shed to make a nice coop.
Good luck with your new chicken adventure!