I would have made it myself but i don't intend to buy CC until campaign will be completed.

So after seeing the crab I tough if it is possible to make a rocket or drop ship with large crab like legs. Tough it seems it may conflict with side thrusters but if so then some kind of transporter could be made.

I think it would be cool if some drop ship lands on thrusters and then walks like a crab assaulting enemy base

You can't add legs to a dropship.