
I wanted to add to your list my pieces:
A R M O R
USA
...
M4A1 Sherman
M4A1(76)W Sherman
a hybrid hull Sherman
GREAT BRITAIN
...
M4A4 Sherman V (with normal gun)
M4A2 Sherman III
Sexton (Canadian)
POLAND
7TP (two turrets)
7TP (one turret)
Vickers E (two turrets)
Vickers E (one turret)
TK tanquette
TKS tanquette
C7P artillery tractor
"Kubus" the improvised armored car build by the Home Army and used in the Warsaw Uprising (it was only one piece, but how many Maus'es there were used in WWII?)
Artillery, e.g. 37 mm Bofors both AA and AT guns, 75mm Schneider...
GERMANY (Polish campaign 1939)
PzKpfw I
Panzerbefehlswagen I
PzKpfw II
Sdkfz 231 6-Rad
Sdkfz 232 6-Rad (Fu)
P L A N E S
USA
P-51A
P-51B
P-51D (new mold, please...)
P-47D Razorback
P-40 - later versions
C-47 Skytrain
GREAT BRITAIN
Spitfire Mk II
Spitfire Mk VB (do you know more beautiful Spitfire, than the 303 Sq. RF-D "Donald Duck"?)
Spitfire Mk XVI "bubbletop"
Mosquito FB VI
Mosquito - all nightfighter versions
Bristol Beaufighter
Westland Lysander
maybe... Wellington?
maybe... Lancaster, Halifax?
POLAND
PZL P-7a
PZL P-11a
PZL P-11c (necessarily)
PZL-37 A and B "Los"
RWD-8
GERMANY
Ju-87 STUKA (all versions)
Bf-109 F and G
Do-17
Henschel Hs-126
V-1 (why not?...)
USSR
Polikarpov Po-2
Petlyakov Pe-2
Yak-1
It's implied that all the tanks and planes above should have the Polish markings, if they were used by Poles

Wieslaw