DIY Troels Gravesen Revelator 851 build

yeah with a cisel.

Here a guy from Singapor showed also a very good technic with a aviator loudspeaker clone. He just stacked layers with different width on the higher half part, the widther towards the cabinet and the lesser width towards the front baffle (with 4 layers iirc). Then with automotive plastic he made the rebates filling the steps to shape the rebate. Clever too.