I got the idea of arming these two trucks with 20cm Flak from the box of Tamiya's 20cm Flak. Here they go:
Tamiya's 6x4 Truck Kruppe Protze + Tamiya's 20mm Flak38
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Tamiya's Horch 4x4 Type 1A + Italeri's 20mm Flak38
There are more images in my latest page. Posting all of them may be too much:
http://www.falconbbs.com/model57d.htm
Comments and suggestions are welcome!