Chris, you beat me to it. I also have a build along in the works. I'm gathering pictures. I went for a linen backed ERC. I was debating on what to do about the back also. But I went with my gut( and easy of construction)I will be posting mine in some time next week in the Build along section)
I've only built 3 ERC bows. All are from trunks. Two were unbacked but only ended up around 38-40# (i was new to bow making). I built an raw hide backed ELB at 50# and took it out one cold day and BOOM! ( but after looking at pictures of FD I could see that my tiller was off, so that was my fault
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I know you can do it. And I will be watching, cause I have plenty of the stuff.