I made a winch system years ago just to lift a 2x6 fully bricked so I could pour concrete under it. I made it by putting a long 3/4" black iron pipe on the top of the truss bottom cords on each side. Then I attached plastic coated steel cable to the pipe in 3 places, one towards the front and one near the back of the firebox, each was near one of the 6 legs, the last cable was near the back of the arch. The cables went under the arch and up to the second pipe and each attached there so each was snug as I stapted to turn the pipes. To turn them I put a T on the end of the pipe and on the ends of the T each had a 3/4" x 30" black pipe.
I'm not sure what force I had to put on the end of the handles to turn the "winch" once weight was on it, but it surprised me how much it weighed. To hold it in place I used a board across the joists to prevent the handle from unwinding. Before raising I removed the pans so I wasn't lifting them too. Just a guess, but I'll say I had to pull maybe 30-40# on the end of the handle to turn the almost 1" O.D. winch pipe. I was lifting 1 side then the other, maybe 3-4 turns then to the other.
To get a close est. of weight, find out how many bricks, half bricks and how much refractory (and some use sand under the flue area) and do the math.
They are very heavy. The second thing to consider is that an arch could easily get damaged if not properly supported evenly as you move it, especially with bricks in it.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.