Hello, Thrift stores often have Headboards for $10-$20 each have you considered looking there? It might be more cost effective than building one.
Alternative suggestions might include
Bed headboard design
21 Clever DIY Headboard Ideas to Spruce up Your Bedroom | Hometalk
How to Build a DIY Rustic Wooden Headboard | Hometalk
Oh my gosh Peg, there are a lot of headboards created by members of Hometalk. Their creativity never ceases to amaze me. I hope you can look through the ideas below and find one that inspires you! Wishing you the best.
Peggy: maybe this will help
There's millions of ideas on how to make your own unique headboard, sometimes difficult to decide on the look you really want.