On www.profils.tk you will find under Profils -> Les Projects many nice paintings of the German E-Series further also the Maus and special Vehicles like the Befehlspanther.
I didn´t found a good blueprint or something like that, but those pictures of a model, which shows the E-79 - it looks quite similar to the T-55 Enigma Tank - a mix of the Königstiger, Panther, E-Series Chassis etc.