As mentioned above, maximum degrees of motion are required for seated viewing. Straight on parallelograms are not suitable for seated viewing.

any type of reclining lawn chair will do.

With this set up, I've never had a problem with tripod legs in the way.
http://www.cloudynights.com/photopost/showphoto.php?photo=2843&password=&sort=7&thecat=500

edz