DIY build - need help/advice in Subwoofers Posted March 2 Test fitting the holes before adding second layer of MDF.... tested again... then added the 3rd layer for a recessed fit with 45* chamfer — I didn’t do a full chamfer on it, I started it right where the basket ends- I thought that would look more seamless. working on bondo on the seams... and making nice and smooth. then I’ll round over all the corners & add a 45* chamfer to the perimeter of the front then cut out the vent and round over the top and bottom edges. ( I think I’m going to leave the side walls squared off) started shopping for paint codes.... leaning towards Bentley Beluga Black with a buffed and polished finish for a high gloss. Then probably ceramic coat it to prevent scratches and swirls in the paint.