Look at the thread of my build PDF 8, page 1, zoom in on the first pic you cam see my return stack and filter.
Look at PDF 9, page 6 and 7. To see my loader valve. I added my steering valve after the loader valve, was originally using the first spool as steering. Since I had the loader valve first, it is the power beyond. I am trying to find that pic on photobucket so I can mark what each line does for you, but they want me to pay so I have to download all my pics and put them somewhere else.. The tank returns are joined, with the same size pipe that is incoming.
http://machinebuildersnetwork.com/ubbthreads.php?ubb=showflat&Number=310#Post310