So I decided to give the repair a shot. I'm glad I did. Now, I know that it's not an astonishing fix, and that it's kinda rough around the edges, but it's my first repair for this kind of thing. This is the best side, the other side will be covered by the rails. I plan on using some wood putty to fill the cracks, so I'll get to learn from that too. I spent the rest of the morning shaping the sides with the sander and disc sanded everything.