Tumbleweed needed for a map

I need a tumble weed that is based upon this model:

props_foliage/shrub_01a.mdl
http://img824.imageshack.us/img824/4102/scientisthunt7000000.th.jpg
which uses the following hl2 textures:

materials\models\props_foliage ree_deciduous_01a_trunk.vtf
materials\models\props_foliage ree_deciduous_01a_branches.vtf

Ref pics:

http://upload.wikimedia.org/wikipedia/commons/thumb/1/1b/Tumbleweed_038_.jpg/220px-Tumbleweed_038_.jpg

Collision mesh needs to be some form of ball as I’d like to use it as a prop_physics (to blow around in the wind).
Also scale can be roughly the same as the shrub if anything a little smaller.

I’d be most grateful if someone has a bash at this, I’ll credit you in the map.

Edit: comparing the shrub to the ref pics, the shurb is almost the right shape just needs rounding off at the bottom.

Oh god, I looove tumbleweeds, I SECOND this.

^ Thanks for the support though seems like no luck.
nvm, I managed to compile the exsisting shrub_01a as physics prop:

http://img227.imageshack.us/img227/1121/tumbleweedl.th.jpghttp://img403.imageshack.us/img403/9951/sdk3dskyboxtumbleweed10.th.jpg

I added $drag (air resistance) 1.0 to the collision model, it certainly bounces around with trigger_wind and env_wind, so I guess it’ll do for now.

There’s a static tumbleweed model in New Vegas.
You should find someone who owns it and knows how to port from it.