Create a cylinder, with 5 height segs (default)
Convert to editable mesh.
Weld all the verts at the top, to make a pointy point.
Then move the middle segs around to make it look like a branch.
Edit>Clone (copy option) this object. Then change the clones in height and rotation and stuff like other branches.
To make a branch off a branch, extrude a face, like this:
http://www.fsdeveloper.com/wiki/images/b/b3/Gmax_extrude.jpgArrange the bottoms like this.
http://undernetmath.files.wordpress.com/2007/11/3_circles.jpgAdd a material and stuff
Link them ALL to 'frame' and stuff
Collision_geometry needs a perfect model, so go to CREATE TAB> sphere button> Compound objects and boolean like this:
http://www.fsdeveloper.com/wiki/images/9/98/Gmax_boolean_01.jpgMake sure you're union-ing.
Boolean one to another, convert to editable mesh, weld all verts to 0.01, repeat.
I hope this makes a flawless collision, it's hard to explain without being there. If i'm on xfire, you can chat while you do this.
xfire: slappythepirate