You don't need a mill. I pressure bed if I get the term correctly. I use steel bed and make a clay dam right in front of the receiver. and make sure to make a channel for the spring guide. The whole front is fully supported. The sides I usualy cut some shallow grooves with a dremel but these stocks are pretty generous already in their routing so it doesn't need much. In the back You need to clay up part of the rear lug recess for bolt clearance and masking tape around the receiver line. I use the brownells bedding collar and clip for the trigger guard. Also make sure to epoxie the front ferrule on with some really strong stuff. Steel bed works there too. The biggest thing is that it is on straight and all the way down. You want an even gap between it and the barrel band when the gun is together or it will cause problems when it gets hot. also since these don't have a liner and you must bed the whole side area where the receiver legs fit I can't stress enough the importance of clay and release agent. Oh Boy is it fun when you stick one to the stock. If you want I will pull mine out and send you pics. Just don't tell me how ugly it is. It has been skimmed twice now and spray painted a few times , I only stripped the outside, and It is pretty rough on the inside . Mine has a few lead strips in there inletted in too but they are painted over so you can't really see. but that bedding job is as strong and tight as any out there. I still have to hit it pretty good to seperate. I don't mind though. I pull it every other week anyway to clean. It never hurt yet.
The way I do it there is considerable foreend pressure but the douglas seems to like it that way. The gi barrel did too. I tried free floating once and it really shot bad. I made my dad buy me a new ferrule and barrel band for talking me into trying it. The stock is so strong you can't squeeze it together at the front like a standard bedded stock.
Please forgive my spelling here, I got 90 mph fingers and a 55 mph brain.
One other thing. I got an old cracked at one time trigger guard that I welded up all the holes in and ground smooth and there are no projections to hang up except for the two hooks . The hooks I made just a little thicker so I don't have to clay the spot they fit into the receiver.It works great for bedding a lot of rifles. Claying all them holes up can get you in trouble sometimes. If you got one laying around somewhere you may want to rig one up too. The gi trigger parts are so alike it doesn't hurt a thing doing that.