I've had my Sherline Mill for a long time.
I've upgraded it when upgrades were available, and it's been a fine tool for precisely removing metal from various projects, lowering cars being one of the projects.
You'll find many more applications for it if you decide to go with the Sherline. I used mine for removing metal for DCC Sound installs, modifying car underbody details when I'm superdetailing a specific car or caboose...and when I was involved in developing tactical night vision, I used it for prototyping what I was going to sell out of aluminum and Delrin.
There are lots of other jobs that will appear if you have the tools to do them.
Although I'm sure a fine job of removing metal can be done "by eye" with sanders, grinding wheels, drill presses and Dremels, having an actual mill will let you do jobs that require precision easily...with no guess work.
A nice thing about Sherline is the availability of accessories as it is a popular tool among hobbyists and has been around for a long time.
Mine was well worth the money, and has been on my bench for decades.
I also have a big Craftsman drill press, and I would never think of adding an XY table to it for milling operations.
Get a real mill and you'll never regret it.
Cheerio!
Bob Gilmore