Just settle on one project at a time, focus on your Back to the Future Bolide, don't have too many things at once.
There could be a magnitude of things wrong with your mod... we can't help if we don't know what you did. Did you properly export the DAE? Is it a separate vehicle? Is your info.json set up right? (I suspect this is the issue) Where did you put your mod? Is the zip structured properly? Have you accidentally disabled mods?
Take a look at how the official vehicles do it, then copy it and change the name. Make sure it's a separate vehicle.
I like the front engine idea, but this car's shape seems very inappropriate for that. The low, sloping hood will allow you to fit a flat 6 or flat 4 in there if you're lucky