This vehicle is the largest model that I have ever built, it's 75 studs long and weighs approximately 7 Lbs. It features fully sprung suspension, composed of springs and on the last road wheel torsion bars combined with springs for improved rigidity. The frontal drive assembly has a 5:1 ratio with a XL motor powering it. The earth spade at the rear of the vehicle is functional too, It can be deployed just like in the real vehicle during firing, to prevent the suspension from collapsing. The 21 cm mrs. 18 Morser is elevated by 2 linear actuators and also has a recoil function, where the gun carriage recoils back 2 studs.
About the real vehicle, The GW Tiger or (Geschutzenwagen Tiger) was based off of a elongated hull of a Tiger II. It could mount a 21 cm or a 17 cm heavy howitzers. There was one prototype that was partially completed but the Allies seized control of it and it was scrapped.
hatches open, the hatch on the left upper casemate, is for the gun's optical sights. The driver's side hatch has the controls for the light in the front, the MG side hatch has the controls for the battery box.
Very functional MOC, congratulations. It is hard to make aesthetic MOC from such a disproportionate original prototype AFV, but I can see that glacis plate of Tiger II chassis is very nicely solved. I agree with former comments: a gun in this size could easily shoot something. I am currently working on a tank gun MOC in comparable size using self contained, spring driven propellant cartridges. I will post it soon, maybe it will help.
oh... my... god... you didnt, really? i cant stop laughing that is just a monster moc... its so big and functional, and amazing its funny, whats next, GW E-100? wait no, this tank is technically bigger, HAHA