@John Barresi (and other builders out there) - this is probably a separate topic, but I'm interested in the design process that goes into, for example, figuring out where and how to vent the MV.  Do you just use experience and feel, or is there any measurement/analysis going on to guide the changes you make?  How do you decide what new venting to try?  At each iteration, do you build a completely new full-size prototype?  I'd be interested in any details you're willing to share. I enjoy bui