The picture shows how the speakers turned out. Wife likes em! Will post a video later on.
Printed the plans out. I needed 18 inch wide panels for the sides and 5 1/8th inch wides for the baffles and dividers etc. Closest were 16 inch wide and 5.5 inch wide. So decided to get enough of the 5.5 inch white MDF panels to make one speaker. Also bought some nice plywood and Lowes cut it for me to 18 inches wide. Was simpler to stick to the original 18 inch dimensions otherwise I would have to recalculate the internal baffle dimensions.
Step 1: Cutting the wooden pieces for the speaker
Got busy with the glue bottle and clamps and screws to assemble the the back, top, bottom and front panels (baffled) onto one 18 inch by 72 inch side panel. Used biscuits to hook the panels together which makes the final assembly quite a bit easier. You can see the biscuit slots in the left most speaker. Even with biscuits is is important that the panels are perpendicular otherwise the final large panel will not fit on top.
While the glue was curing, I cut the 5.5 inch wide panels into 38 pieces based on the handy table included in the plans. This was a bit of a work as only had a handheld circular saw.
Glued the internal labyrinth of baffles in. And painted exposed surfaces with black paint. Let everything dry and cure overnight.