I don't know if you need this anymore, but i managed to find this:
http://www.achtungpanzer.com/pol/polprot.htm
20/25TP (Heavy Tank)
multi-turret heavy tank,
similar design to Russian T-28 tank,
three projects were made:
BBT design (1936/37) - 23tons, 40mm Anti-Aircraft or 75mm gun, 7 men crew, 40km/h max. speed and 50mm armor,
KSUS design - 22tons, 40 or 75mm and 35mm armor,
PZInz design - 25tons, unknown and 80mm armor,
I also found this interesting website:
http://www.odkrywca.pl/pokaz_watek.php?id=182824
It's in polish, but it contains many drawings and actual photos of polish weapons.