Total rubbish, You have no idea what your talking about, Those side panels are all machine jointed using advance Spindle Molder technology. Not simply Butt jointed. This is high quality cabinet making by craftsmen. The internal chassis framework, not only holds the sides [ internally screwed ] it also hold the 2 section dividers. Isolating the mid /tweeter / bass sections. Only the Bass section is rear ported. . The 3 sections where then Lead lined before the sub-baffle was fitted . More rubbish, That sub-baffle is three inches thick, The finished baffle plate is yet to be fitted. It's a direct copy for a Magico baffle, which incidentally is made of 6 inch thick machined Aircraft grade aluminum. In most cases the driver is total in-closed in the baffle. So what would you suggest I chamfer, and to what degree. As for the sides producing some diffraction, There is ample clearance. My I ask when experience you have in speaker design, and show some examples, then you can judge., or are you simply another Google jockey. Three pairs where made for customers, two of which where sold, I retained the third pair for my own use, We spent something like 4K [per pair ] on the hardware, and are hardly unlikely to make rudimentary mistakes in design when your spending that sort of coin. We only bring them in when it's raining, and at 75 kilo's each, we are thinking of designing Raincoats for them..