Don't think I will be cutting it apart, rather will be using some "screw" type couplers in strategic places.
Yes, the "walking" sprinklers are still made...about $65/ea. Nelson makes one, John Deere makes them, may be others. Think Walmart carries them.
Hydro-seeding is for people with money... :-) I am retired, have more time than money... :-( Also have a 1yr old Garden Tractor with a 42" cut. Takes less than 2 hrs to mow, plus using the trimmer. Have most of yard laid out so that trimming is at a bare minimum.
Kentucky Blue Grass does take a lot of water, -may look at other species of grass- and that is not cheap out here [Southeastern Colorado] but the two Yorkies and the grand-kids like it better. When we lived back in your neck-of-the-woods [Plymouth, Indiana, about 20 miles south of South Bend] I used to think that I would never have water problems, being just 50 miles [the way the Crow flies] from Lake Michigan; but alas, we moved out here where water is very scarce, and expensive...neighbors who have grass and are trying to save it in this drought are having water bills of $235-$320/month, and that is just the water portion, not counting what the town adds on for their needs and other services provided.
Hey, if you ever want an education regards Sprinkler Systems, check this out: http://www.irrigationtutorials.com/sprinkler01.htm
I found it this afternoon. Answers many questions, and expels many myths about the process; myths like going to smaller pipe increases pressure. It does not. It reduces pressure. The gentleman that wrote it is a Professional Landscaper with a Hydraulic Engineering degree, but he has a wonderful ability to put things in "laymans" terms.
Thanks for your input. We are thinking along the same lines as the Irrigation Tutorials above, though I was going to mess up by not using larger pipe. Give it a look, and if you have friends/relatives that are looking at Irrigation Systems, pass the link along. It is outstanding.