Depending on what you want to do with it, it might be a good or a bad design. The number you give do not completely fit with the picture but don't sound so bad.
So not giving it any from gives the following shape with a center of mass about 7.5 m above the ground.
So do you have any change of tipping over in rough terrain? If you go nose first everything is probably ok, sideways gives more danger but not as much as you would suspect. The tipping point is if the Center of Mass (CoM) lays outside the base, this only happens after a tilt of 40 degrees as can be seen in the picture.
So what is the ground pressure it has. To calculate this you need the weight of the crawler and the area of the tracks. For the area of the track I took half the area of the bottom. For the weight I took 140 time the weight of the Maus as this is the biggest tank build and this is roughly how many times the Maus fits in the crawler. I think I am highly over estimating the weight since the armoured plating only has to be on the outside so I took half the weight, but you can use any number you want.
So the ground pressure exerted by the crawler becomes:
Ok so this is a bit heavy but it is somewhere between a montouain bike and a road racing bike, see this reference, wikipedia of course.
If the weight reduced (which I think is logical) and add slightly more track surface the contraption seems feasible. Whether it is usable depends on the application.
One note on speed, since it is such a huge mass with relative high CoM you need to take care of the inertia of the crawler. Any slightly tight cornering at higher speed will cause it to tip over.