>>1009763 (OP)As long as you're honest about what is done by you, and your abilities, and those assets you used are legal to use in that way, then sure. This will of course lower your chance of getting hired, since you're basically a hack.
But if you get a job thanks to a kitbashed model, and you're not honest about that, what are you going to do when the studio asks for something you can't kitbash? Be it due to a lack of skill, or resources, since you're limited to only what is free to use, when working on a commercial product, and can't just rip someone else's work without permission.