I have reciently been experimenting with sticks, I made mine with sticks and a bolt as described above with a couple differences. You can get trim molding at any lumber yard, I like stuff about 1/4" thick by 1 1/4" wide, you can even get it in oak or other exotic stuff. Instead of one hole for the bolt, I drilled a series of holes and put a wingnut on the bolt, so I can use the sticks in the highest position for kneeling, or lower the crossing point and use it for prone. I even have a pair of holes line up so I can make it into a straight stick to use offhand. No it isn't as accurate as a bipod, but it is better than shooting without any help.
When you hunt antelope you have lots of time laying on hilltops trying to figure out how to get off an accurate shot without having to shoot through grass. There usually isn't any pressure about time , so the versitility of my sticks is useful.