David M.;
That running gear.... Hmmmm. Well, it looks pretty involved! Looking at what you have going, I think I would approach things the way I did for the Italeri Semovente L6/40 da 47/32 I recently completed for the "Under different flag" campaign being run over on Armorama.com. In some ways, the road-wheel bogies are rather similar- paired wheels captured in pairs between 2 plates, which also capture a "bell-crank" which the composite plates-plus-2 paired wheels pivots on. The point being: I love to paint my wheels before I mount them - but how to get this to work given that they are then captured within stuff to get mounted on the vehicle? My solution: I painted all the plates, bell-cranks, and wheels separately, and then assembled the painted pieces into a completely base-painted unit. While a little involved, this process worked quite well - primed all the pieces with my weathered black Floquil RR enamel - which serves also as my rubber color. I then masked the wheels and painted the hubs with the base-coat - also all the other bits. So - 2 runs with the air-brush - "rubber" and "primer", base-coat (ModelMasters Italian Sand enamel, in this case). Looking at your instructions and your pieces, this 2-step could, I think, work for you, too. The trick will be to clean off a little place for glue before you cement bits and add on the PE (using CA, I presume). After all are assembled, you will want to go back and do a little touch-up with a brush on glue spots, maybe.
Of course, you will want to paint in the wells before installing the units...!
My task was further complicated as my running gear was going to get some "tri-color" camo added on - which realistically wanted to happen after all was assembled, so that the gear was in the hull pattern... I don't know if this will be your issue, but it worked, with a little care for me.
As to the Amusing kit: it portrays the 3 armored types. I am hoping that Amusing is maybe going to make a "Rheinmetall" - turreted prototype like the Trumpeter kit, but I'll probably not wait and will grab this one when I can!
Cheers!
Bob