Dear Jerry,
I'm not sure which sites you've checked, but my all-time favorite for backyard putting greens is Leo Melanson's Beginner's Manual for Back Yard Greens, at
http://www.putting-greens.com
Another helpful site is Rob Crompton's BackYard Putting Green, at
http://backyardputtinggreens.homestead.com/Front.html
with a message board at
http://coolboard.homestead.com/boardshow.cfm?mb=621941879579774.
Both of these people are very friendly and will likely give you some great pointers.
Leo's email is LeoMelanson@Mediaone.net
Rob's email is rcrompton@home.com
Cheers!
Geoff Mangum
The PuttingZone
http://hometown.aol.com/puttmagic
The Future of Putting Now - ewlite instruction, comprehensive resources.
PS - I'll be adding a section to my website on greens agronomy, design and construction, and this will include backyard greens, so check back! And sign up for my mail list at
http://puttmagic.listbot.com to receive periodic messages about putting.