How can I build a headboard?
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Suggested Project Book
https://www.hometalk.com/diy/s-headboard-ideas-42193213
https://www.hometalk.com/diy/bedroom/furniture/shiplap-headboard-28950585?expand_all_questions=1
Shiplap Headboard
It may be much more cost-effective for you to modify an existing headboard did you pick up at a thrift store.
What kind of design style do you like? What size do you need?
Use old doors ( horizonaly).