I have been "kit bashing" since a kid, turning my disliked Marx #21 into a double ended/cabbed diesel, uh, not particularly successfully. I have lots of practice, and attack expensive kits with no trepidation. I like them to be "different". Might be good idea to start small, and work up. But if you can make today's trains' electronics work, gluing together a box of sticks is well within your grasp.