If you are a student who is currently taking the course, a solutions manual will hurt you more than help you, if you want to learn wood design. You can't learn by example, better to spend the time on the concepts. If you are just interested in the grade you get, it may help some, but will eventually hurt you more if you need wood design in the future.
Teachers can get solutions manuals pretty easy for textbooks they use, but I think even they have to go through the school to get them.
I found a website that says it has them for sale, but I would never trust them. I used the same info you have in quotes from your post in the search engine. No, I won't tell where it is.