This is clearly the easiest design we've done, but it's what my daughter asked for that year. To get enough height, I had to cut the original block down to get rid of the "driver's seat" indent that they cut into them, and glue the block from another kit onto it. The wheels from the second kit came in handy for the Choo-choo train.
One useful technique: the windows, bumpers and stripes are just electrician's tape -- it was easier than trying to paint them. The headlights are thumbtacks, and the taillights are red tape, cut out with a hole punch.
It was way overweight like the Choo-choo, so there are a lot of big drill holes in the bottom, where you can't see 'em.