On a more serious note:
I've had 5 knee mills over the years, and have been in quite a few shops of members all over Canada.
Even the smallest of tabletop mills takes about 3 feet wide of a bench, when you account for the movement of the table. There is nothing you can do above the mill, as you have to have access to the top of the quill.
Storage below is possible. Care must be taken to not get a lot of swarf into the drawers (I'm talkin' to you
@DavidR8 !!
)
My smaller knee mill that I sold over a decade ago, took about 4 feet wide in the shop. It was perhaps a foot to 18" deeper than an RF45 tabletop mill.
As to poundage, I've moved lots of heavy stuff, and I'm always happy to help (I also have a lot of moving equipment). I've taken full sided lathes and mills into and out of basements, as well as garages...
Some Thoughts: what is it you want to do with it? Learning? Small steam engines?
- it is a lot easier to learn on a tight mill with wider ways and more mass. You will break small cutters far less often, and in general you can do nicer work easier. You can do small work on a big mill, but you cannot do larger work on a smaller mill without some serious accommodations.
That's why I sold my BB B048 8X32 mill: No ram for wider work, no nod for angled cuts. Its replacement was a Modern Tool PM945 clone. Same foot print, much wider capability.
@ducdon has that same mill, and loves it. (That's my small mill BTW)
[last minute update] Bench top mills resale value varies (often poor prices), but you get far better coin for a floor standing knee mill...