Thats looks 100% amazing. Contact adhesive two part glue and spray activator may help! That stuff will stick ice to a flame! I've used this on things that need to be stuck forever, but if you're gonna use this make sure you've made up your mind as once it's stuck down, it'll never come back off. I've never used this with moulds to wood, only plastic to plastic or plastic to wood and metal. As I said, what you've built is amazing. I'm already looking for space on walls to try and build one myself!!