That is so easy!
Of course when i first time try get models in view that was quit difficulty, but now peace of cake!

Then code here:

ENTITY peksi ////////this is model in view - that mean when it
//never will make trobles in game world!
{
type = "earth.mdl";
layer = 11;
view = camera;
}

//this write into your mouse function behind pos and cursor
//sinhronyzing!
temp.x = mouse_pos.x;//we now give three vectors for model
temp.y = mouse_pos.y;
temp.z=500;
vec_for_screen(temp,camera);//convert them in view
peksi.x = temp.x;//give new coordinates to model in view
peksi.y = temp.y;
peksi.z = temp.z;
//and vuala - model moves together with mouse positions

if you want that model rolling and doing all kind effects then i hope how to done it!