I would also like to see a picture. there are a few issues that will make the job not suited for a mill, if you have sharp inside corners or some other features that make milling difficult or drive the mill cutter too small. This is what will price you out on small jobs

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1982 300CD Turbo (Otis, "ups & downs") parts for sale
2003 TJ with Hemi (to go anywhere, quickly) sold
2001 Excursion Powerstroke (to go dependably)
1970 Mustang 428SCJ (to go fast)
1962 Corvette LS1 (to go in style)
2001 Schwinn Grape Krate 10spd (if all else fails)