I set out to make the front half of the central hull interchangeable. I thought about magnets and sliding tabs, but it turns out the foamboard H section you see here actually holds itself in place perfectly! The foamboard has some give so the track sections have just moved a millimetre or so and are now holding the hull in place. Might stop working if I add too much weight later.

Also got started on the upper hull detail.

I promised myself I would NOT build an assault ramp because it would obviously weaken the prow armour of the tank (plus I'd have to detail an interior troop bay). Well.

I had some plans for the prow that didn't quite work (so far). The problem is that the lower prow armour is big (twice the height of a marine) and angled (at about the same angle as a Rhino rear hatch).  It is hard to imagine what else to put there.

So, a three part hatch with interlocking armour plates about 2 foot thick. This is just a test fit.

Some more work (on both sides although I seem to have only photographed the left) on the hull detail. The large square will obviously mount the sponson.

The chamfer on the upper hull edge will be detailed further with some 0.5mm or 0.25mm plasticard. This bit could be tricky, but thin plasticard is pretty easy to work with so I'm optimistic.