The reticule assembly should push out if all the screws are removed. Have a look inside the tube with a flashlight just to ensure there are no dents that will interfere. I suspect you'll need to push it out the long way. I'm pretty sure I gave that tube a de-rusting in vinegar many moons ago, so I must have removed the reticule assembly to do so, which means it will come out. Of course no point doing so until you're ready to do something with the tube. You've got the most important bits there: the tube and the reticule assembly. Given drawings and lens specifications, the rest could be duplicated and lenses sourced. But if that kind of project isn't your thing, and you don't have another Aldis No2 or 3 to work from, perhaps better passed on to someone who does?.
The rings are soft soldered on so you should be able to get those off easily once the reticule is out. Once you have their ID, turn a brass rod to that OD +/- and get them TIG welded back together while clamped over the rod. Then it would be a choice whether to TIG or silver solder the missing "legs" from the rings. TIG if done slowly and carefully might be best as silver solder always shows through browning.
There's only time for so many projects though!
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