I would really like to see a ~2000-2500 piece road grader, with walking beam suspension, articulated frame steering and front steering, a ripper on the rear of the grader, and a three point hitch on the front of the grader to be able to attach either another blade, or some other attachment, BUT, the pieces must be included in the model to build a front attachment, not just be the b-model like 8110. the articulated steering would be controlled by a small actuator, the front steering would have to be controlled by a compact system of steering maybe a 1x5 pneumatic cylinder with a valve for left or right, or a long drive-shaft for steering. the b-model could be a pan-scraper, not as functionable as a road grader but it would still be pretty big. just my idea, maybe i should try to build one the plans are building, time to find blueprints.
i think the pneumatic 1x11's would be perfect for the 2 levels, the hoses would be hard to route because the ports are so far apart.