Konstantin
Having rebuilt an old boat, I recommend getting out a tape measure and record all measurements of everything you have. Specifically measure all stays, mast and boom lengths, all lines that you got with boat. Also, such things a spreader measurements, lengths and sizes of all major screws and bolts, etc.
Also document what you have with pictures. Pictures of interior, ports, steering mechanism, gooseneck, sliders,etc.
As to information about rigging, what do you need? With O'Day boats, other boats may have same mast and boom. So measure mast and boom accurately and look at other boats by O'Day and see if measurements are same.
Too further complicate things, O'Day would put different mast or booms on same boats, probably to use up existing stock.
Keep asking questions,
Ed K
26