Bulk Grain Wagon Conversion, Part 1

does it require a wider clearance on the curve tracks given the extended length of this rolling stock?

Total length without couplings is 104mm. A standard express coach is 117mm, so length itself is not an issue. However the wider axle separation (60mm vs. 45mm) does mean that it overhangs the inside of a curve about twice as far (c. 6mm vs. 3mm), and it hangs down quite low, so there could be issues with line-side structures, though I haven't noticed any yet. Drag on curves might be a bit higher too, but probably only marginally.