scramble-city, no

It took me forever to find a way to do it at all, and have all the limbs look proper and have same lengths.
super-poseable? hell yes. today I did some face-transplanting and modifying to cyb downshift and he's now Wildrider. I also did the head-mod and the leg-mod so that he's fully poseable, and his waist is the elbow of the combiner limb, so now he has arm rotation as well. The hands are from Omega prime which are highly poseable, and as they combine to the limbs, they'll have wrist rotation too. the legs use prime's thigh rotation for them, plus you can rotate them at the knee joint.
I used Mirage as a leg even though that isnt' the most common position for that mold simply due to having the limbs look good (I couldn't come up with a good enough looking arm mode for that toy AND also have it be the same length as the other arm)
The trailer's city-mode will actually be fairly similar to the original's, and that's pure coincidence, but a happy one!

Tomorrow I'll be working behind the head. I have a piece that folds on a built-in hinge that will go behind the head and can fit inside the engine piece, so that you won't see it in car-mode, but when in arm mode it can be used to hold the head down inside the hood. I'll also be cutting the cab and putting a hinge inside of it so that it won't hinder elbow movement in arm-mode, it'll be able to bend out of the way.
Oh yeah, there is ONE weakness to my poseability in combiner mode... the hotrod arm! It IS possible to make his waist rotating, but I do NOT have the tools you'd need to do it, cause you have zero room for error

I think that I'll just have to swap the arms for certain poses... would be nice if both arms had full articulation, but hey, he's sitll going to be surely the most poseable combiner out there?