Tons of background and technical data for the M2 is available in the threads below. No need to review here.
http://www.audioheritage.org/vbullet...erence-Monitor
http://www.audioheritage.org/vbullet...-M2-DIY-Thread
I discovered the M2 components were available through Speaker Exchange over the Labor Day weekend and ordered up most of the parts. My original thought was to try a curved cabinet or something like the S4700 to avoid the blacked-out utilitarian M2 monitor look. The 4367 was released before I had a final plan....so it was a pretty easy call to borrow from the 4367 looks for my M2 box. A walnut veneer and black baffle was chosen based on member BMWCCA's beautiful monster monitors.
I decided to go plywood rather than MDF and my first step was build a frame to attach the panels to. Doing the bracing first is bassackwards but that is how I did it. I had lots of 3/4" and 1/2" plywood scrap in the shop so I used it. Lots of glue, dozens of 15 gauge finishing nails, and a few pocket screws and I had frame to work with.
3/4" pine plywood was used for the inner baffle and the outer is 1/2" plywood. I used the 3" precision ports (Parts Express # 268-350) and mounted them backwards to minimize the visible flange. Outer diameter is 5.25" so I used a 4.25" hole and a 1/2' roundover bit to flush-mount the ports.
A few steps later and we are here....