That's a nice rig! I have a simmular set up but I dont see how you could use it for decking a jug!I have both a three and four jaw self centering heads for the lathe but I cant chuck a cylinder in etheir IMO it would need a jig to allow the use of the tail stock and live center.You really cant clamp it true perfectly in just the head as I found it's always just a little out when I set the dial indicator just at the top edge inside the jug and spin it up slowly I have had it true but then when you spin it at cutting speed it shifts abit not being concentricly shaped I guess.I use the mill for boring out carbs,doing the balence holes in cranks,changing 6mm studs to 8mm and stuff like that and the lathe is great with the dial indicator for truing the crank, making velosity stacks and small parts like stand offs and custom hardware!