4x scratchbuilt T-92 & T-93 US SPG tanks (monsters)

With interchangeable barrels (200mm extra-extra-long & 240mm barrels).
I lost count at 100 parts per unit, all but the treads (Pershings had to die to make these) are made from paper, cardboard, balsa wood, brass rods, brass & aluminum tubing, heated & stretched plastic sprue, thread, etc.
2-part Ammunition has not been added yet, but will be put in yet.
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Front hatches: Brass rings, filled with putty, and edged with 3 layers of glue (to make beveled lip around hatch), brass hinges.
Spade: Plastic pen body, brass rods, and paper frame.
Gun: Aluminum tubing for main barrel sections, with brass and rolled paper parts.
Rear hull sides: Paper and cacrdboard, saturated in super glue (rock hard).
Hull: Balsa
Gun lock: Square brass tubing with brass rod inside, brass wire, and paper.
Flooring: triple-layered cardboard, paper, and plastic sheet.

Here they are with thier 60lb powder charges, and projectiles (6x that weight).

Thanks. I have been called McGyver in a coupl eother sites I posted these on now. For this to be compared to McGyver, they would need to be able to fire whole cabbages at the bad guys and knock them out  … oh wait, that was the A-team.
Thanks!