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sure, I am lacking vital information here.....how far is the truck already submerged...and is it supposed to sink rapidly??!

Sorry to keep you guys in the dark. Here you go: The damaged Tamiya truck was a nightmarish afterthought and has now become a complex addendum to the overall scenario

-- unless I decide to back out.
The premise is: This vehicle has partial damage from a Luftwaffe strike; the supporting ice fractured immediately and the vehicle sank too rapidly for its crew and cargo to be saved. Some time has passed and the hole above has become frozen over again. Now resting at the bottom of the lake, there is sand build-up and underwater growth apparent on the vehicle and its scattered cargo. Above, small monuments (makeshift crosses) have been constructed and placed to mark the crew's final resting place. Meanwhile, another deadly Luftwaffe strike is taking place with Soviet machine gunners defending their precious supplies.
Proposed lake-bottom construction:
(Part 1) FoamCore lake bottom base: The damaged Tamiya truck will be positioned and affixed to the base for subsequent full submersion (Note: I chose 1/48 scale for this part anticipating liquid magnification). The base will be temporarily framed and sealed for pouring of a clear Lucite compound. A small amount of acrylic paint will be added to simulate yellowish murky water.
(Part 2) Top Layer: Ice and snow build-up on the cured Lucite cube (above). The slowly sinking GAZ-MM w/escaping driver and shifting cargo and the GAZ-AAA w/machine gun crew will be positioned accordingly for the final scene.
There you have it. And I have no idea if any of this will actually work as planned -- sure hope so.
Comments and advice on the pouring process welcome ... not the beer pouring process!!!
—mike