Rainbows
Probably around 250 to 350 lb going by weight estimates on similar machines. Meddings 5 speed bench drill is about 180 lb. The Elliott Progress No 2 will be rather heavier in the head due to the back gear gubbins. Pillar versions seem to come in around 50 lb heavier than bench ones in this sort of drill size range.
Dismantle, strap to plank and slide down bit by bit under control of a "come-along" of some description working in reverse, pay out, mode. Got a Machine Mart cheapy donkeys years ago for occasional jobs of this ilk. Served me well. These days I'm more inclined to get creative with an electric scaffold hoist. Got a couple of the £50 Lidl variety. One of which is permanently mounted in the loft for lifting duties. Beats the pants off trying to shove stuff up the ladder and through the hatch. My hatch is about treble standard size too!
You will need some sort of lifting assistance to get it back together and stand it up. Probably easier to re-assemble with it partially tilted so the head is at a more manageable height when putting it back on the pillar. Or, if you have room for things to swing and a suitable means oj hoisting, put the head and table onto the pillar on the floor or, better, a pair of workmate type benches. Then hoist the head end and guide the pillar into the foot socket.
Good job you weren't tempted by a Pollard 15AY like mine. Just shy of 1,000 lbs. That would have been a mite challenging.
Clive.