I took a quick shot at it. It’s a lot of little steps but not overly complicated…
I put a tank on a perspective view from the symbol factory and copied the tank body path into an svg file. I opened the svg file in Inkscape. Within Inkscape I duplicated the path leaving with two black shapes that represent the body of the tank. On the front shape I recreated the metal looking gradient (copied values from perspective) so I ended up basically with a copy of the tank body. Then I cut a hole in the front shape (using Inkscape I drew a path and took the difference of the hole path and the tank body path). That left me with a hole in the ‘tank body’ to see the black shape behind it. Then I added a gradient to the back path to make it look like liquid. Then I saved the svg file (Recommendations for svg editor - #8 by dkylep), dropped it into the perspective.
I copied each element from my new tank body and pasted it into the elements of the existing tank.
The I bound the gradient positions to a slider value and added a text layer as well. Here’s a quick GIF and I uploaded the project as well.
Tanks_2020-08-13_1604.zip (9.3 KB)