You're in the right area. Roderick's was at the corner of East 22nd and Nameoki. It's still there. I believe there's a Brenda's catering or something operating in it.
And yes, Hobo Jungle actually ran from the back of K Mart all the way to IMOS. It was a large stand of trees that train jumpers used to seek shelter in while hopping freights on the 203 track line. When the baseball field was built in the late sixties and traffic was heavier out there it started thinning out. Then when the development of the K Mart property started, all the trees were wiped out.