keg to conical fermenter

hey guys i was thinking about turning my sanke into a conical.let me know if this sounds like a good way to do it.i want to drill a hole in the bottom of keg big enough to fit a 4 inch furrel have that welded on than use a 4 to 3 inch tri clamp adapter than use a 3 to 2 inch tri clamp extension and a 2 inch tri clamp with a 1 or 1/2 inch mpt fitting to fit a ball valve. for legs i would use 1 inch square tubing bolted to the skirts of the kegs. bolted for easy removal plus i want to put a heating pad on keg and it would be easier to put under legs so its up against the keg.if this sounds like a good way to do it or not let me know.thanks for all input. p.s. the keg was obtained legally before anyone asks.