Thanks guys! The cab has gone though some major changes... I think it looks much better now.
Ahh, sorry to dissapoint you, but they aren't descend working I toyed with that idea initially but the whole system would take up too much space and too many pieces.. both of which I don't have. It'd still be possible to mount a system on top of the stabilizers with sliding long axles and frictionless gears a la 42009 but it would be needlessly complex for such a small feature (IMO).
Anyway, it's a rather crude system tbh, I had to make the space between the outrigger housing and the unit that drives the gears quite large to eliminate friction and avoid awkward axle angles. But it does work smoothly. Hope this helps :)
anyways, hope you enjoy these rather horribly taked WIP pictures
With mockup of the crane -