The SU-26 is a Soviet-designed SPG (self-propelled gun) produced in late 1941. Three of the 12-14 units completed were used until 1944. The SU-26 is unusual because it has a turret -- a feature not shared by many SPGs.
About this creation
The virtual tank image from World of Tanks.
The Lego version is not especially accurate as many of my pieces are currently used in one of the 11 MOCs I have built right now...
Finally I have tank treads!!! Notice the distinctive turret shape.
With the amount of parts you have available, you did good. I think one day you'll get the opportunity (and the parts) to build very detailed vehicles, so keep doing what your doing. Never stop tanking :)