yeah, that sinusoidal valve is bada$$ isn't it! It's not as easy as it looks either. I found from a local acrylic worker to use certain typre of files, drills, etc. and I do flame polish some stuff I make. That piece above kind of sucks because it's actually two pieces. There is a thin piece on the top side that is lamenated to the base, and when I did it, the glue ran and crazed the inside. But you can see that I routed the edges and flame polished them, and they didn't turn out too bad. Had i not messed up with the glue, that piece would be crystal clear.