These are no more fragile than a locomotive.
They have some delicate details like the railings around the cab, but that's no different than the handrails of a loco.
To begin with the pistons on the hydraulics were a bit stiff and care needed to be taken that they did not bend when being compressed, but once I had carefully pumped them in and out a few times, they seemed to be much better.
Very handle-able. Just treat it with care and everything will be fine.