Hi Cliffrod,
Yes I'm sure you are correct about the inside and the rust. I thought that if I start with a clean box maybe it will not get any worse. The bottom cone on mine is 4 sided and actually uses a negative draft shoot into a cyclone dust collector that usually is mounted on the back of the cabinet. I'm building a seperate stand for it and the discharge filter of the blower for better floor space use and allowing me to better store it when not in use vs the collector on the back of the cabinet.
http://allmetalshaping.com/attachmen...1&d=1575339461
http://allmetalshaping.com/attachmen...1&d=1575339461
IMG_20191124_175217719.jpg
IMG_20191124_172554214.jpg
TX
Mr fixit
Chris