My diy sub project was in its finishing stages but I ran into a road block... the stain came out uneven. I thought I had sanded everything pretty even and the wood veneer is birch so I didn't think it needed pre-stain conditioner. I figure I can sand it all off and try again. Or maybe apply another layer of veneer and start all over. Any tips or suggestions? I'm obviously not an expert woodworker so I would appreciate any help you guys can give. Here are some pics thanks in advance.