I would think some more about the window. I would make a bridge crane
with maybe a 10 foot long beam.
Position the machine tool to the side of the window. Move the bridge
crane in place so you can pick up the machine too slightly and move the
trolley on the beam so the machine tool is over the window well, lower
to the bottom of the window well.

While you are making the window well big enough, how about changing it
into a door with either stairs or a ladder to get to ground level.
Then you could bring in stock without going thru the house.

Dan