yes it is possible, all you need is to find your save file on your android device and somehow transfer it to a pc. The location of these files is printed in the game on the screen where your saved creations are listed. For android it is Android/data/com.evertechsandbox/files
This furiously reminds me of Scrap Mechanic. I haven't played the latter in a while, so I can't tell if you made most of it yourself, therefore I'm not reporting anything. All I see is that the thumbnail shows an engine straight out of Scrap Mechanic.
the 3d model of an engine was similar but it was modeled from scratch. It was replaced recently with another one but in the android version of the game.
yes it is but it isn't up to date so the best reasoning for playing the up tp date is to use an android emulator. The most up to date apk is on their discord.