Bike turned to pack mule

A few years back I was given this old bike by a friend of mine for helping them  pack up for a move across the country she couldn't take it with her. I have been riding the  bike pretty hard over the  years and shes been good to me but starting to show age and wear a bit. Come over the next year or so as money allows I am going to do a complete tear down and rebuild the old girl from ground up. As of right now it is an old single speed coaster brake nothing to fancy but shes fun to ride. But I live in a somewhat hilly area and planning to use her in the backwoods a bit and  riding off pavement so needs a few more gears so planning to upgrade  to an 8 speed and gonna rebuild  the wheel myself. Nope never done it before so will be my first try at a ground up  custom built wheel should be interesting. I will be adding more on this story as I go and will be posting pictures of the  build and tear down once it begins this is how the old girl looks before I put some primer  on to slow down the rust. Pretty rough eh? should be fun