does anyone know why the skybox models (models/props_skybox) aren't scaled 1/16 like you should scale your brushwork for making the 3d skybox?

i found them to be to big.
if you place the skybox landingboat in your skybox geometry near the border of your map and the normal levelsize landingboat into your level right next to it, the skyboxmodel is bigger...

i'm asking because i made the skybox cows yesterday, and now i'm not sure how to release them. with the proper 1/16 scale or with the "matched to fit the valve skyboxmodels scale"

the $scales are 0.0625 (1/16) compared to 0.15 (matched to fit the valve skyboxmodels scale)