Thanks for your encouragement! I think, I'll try some more. As a first batch I bought 2 PzKw 38(t), a Dodge Ambulance and 2 Kubelwagen (and 2 Marders, of course).
For the price those Arrowhead models are really not bad, and with my choice there are no issues with the missing assembly instructions (what I did, however, when detailing e.g. the Miniwings Choctaw and Shawnee, is, that I referred to instructions from models in a larger scale. Could also be helpful for a gun)
@namibia3011: thanks for the tip and the links! I even found some more in 1/160 - didn't think of that scale! Now I have to wait until the decals arrive . . .
The name 'Marder' is indeed ambiguous, the more, as it's one of very few which were used again (oK, they made the Tiger fly). Looking in old docs, it seems, that initially names for equipment were not common in the Wehrmacht. They only became popular (among the troops) with the Tiger (and Panther later), and particularly with the publication of the Tiger Fibel (comic style handbook for crews). Marder, Hetzer, Nashorn, Hornisse, Wespe etc were usually referred to by their purpose: 105 mm howitzer (SFL), Panzerjäger 38(t) . . . Striking names were definitely used for propaganda purposes, same for airplanes (don't think any pilot flew a 'Sturmvogel' or 'Würger', they were referred to as Me-262s/Turbos or FW-190s)
After the war, the Bundeswehr went back to square one by naming their new vehicles quite plain Schützenpanzer kurz/lang, Jagdpanzer Kanone/Rakete, Bergepanzer Standard etc. That changed, when the Leopard was fielded. The tank was a success and (probably trying to capitalize on that) the following vehicles were all given names (Marder, Jaguar, Gepard, Fuchs, Luchs, Wolf, Keiler, Büffel, Iltis ...I could go on).
And the names stick - German army crews and tactical orders use the names nowadays instead of the function.
What I'm still waiting for is a vehicle called 'Löwe/Lion', apparently somebody still thinks there's room for improvement . . .