Here are some 1/56th scale plastic kits that Rubicon Models should consider:
+ Panzer 38(t)
+ Panzer II
+ SdKfz 10 Halftrack
+ Krupp Protze
+ M24 Light Tanks
+ M3 Medium Tank
+ 8.8cm Flak 36
Why?
No one else makes one of the above in plastic, which can make it useful for modelers as well as gamers alike. Yes, some gamers like the resin vehicles, but I am not one of them. From a modelling viewpoint I almost hate the resin stuff because some of it (not all) is just pure crap. I hope I'm not in the minority about this idea.
Krupp Protze note:
Something like the Krupp Protze Kfz.70 might look great and be of interest to many, for a gaming point of view its really only an early-war vehicle. The SdKfz 10 Halftrack was far more common and if I had to choose between the two for kit production, the better choice would be the SdKfz 10 Halftrack. To bad because the Krupp Protze has a really interesting look and design.
Panzer 38(t) note:
Contrary to popular belief, the Jagdpanzer 38(t) was not a modified Panzer 38(t). This might lead people to think that because Rubicon Models has a Jagdpanzer 38(t) kit it would be easy to release a Panzer 38(t) kit. Simply not true, because the Jagdpanzer 38(t) was almost a completely different tank for manufacturing purposes. Even the main road wheels, which look very similar, are different sizes. I think the only part that the two tanks have in common are the upper return rollers.
8.8cm Flak 36 note:
Probably more interest for modelers than gamers because 1:56th (28mm) miniatures are mostly used for squad level (skirmish level) gaming, and a 8.8cm Flak 36 would not be practical on the table top. It would look nice and it could be a good objective for a game/scenario, but if I had to choose between the AT-Guns for kit production, I would list the Pak 36, Pak 38, and Pak 40 as a higher priority.