I don't have it apart yet, but the volume in the stock pod isn't much. I was considering a similar idea (just extending/enlarging the stock pod). That's where the porting question came from. If I'm already fiberglassing a bigger pod, there's no reason I couldn't do an external port without much extra work. Heck, I guess I could just shove a tube onto the existing pod if the volume was about right. Doing the work would require pulling the rear clamshell off, but I'm going to end up doing that anyway so it's all a kind of "while I'm at it" thing... which never ceases to cost me money...