When it comes to thing like cranes, within limits, its the size rather than the scale that matters. Its the people-related bits that can give the game away, like doors too small to get through, railings above head height, control panels where the operator would have to jump up and down to work things and steps that would need crampons and a squad of Sherpas. Best bet is to carry a figure of your chosen scale with you, and compare it to the intended fitting if you get the opportunity.