Sorry, while working out the game play and P was just getting into the water for B to mount, the win was triggered on it's own. Same thing happened on the 2nd attempt.
I also did not have the difficulty @gmacpro experienced. It all worked fine. Nice straight forward game, , but the low ceiling around the finish was just a bit annoying and all that red brick is hard on the eyes, .
Mine auto-completed like @gmacpro, but it took longer. I think it was caused by spinning the model around while the WinR was bent down. Putting the win block on a slider with rails instead of an R body would stop the behavior and leave the same game play. And if you decide to fix it, take out most of the red brick while you're at it. VERY hard on the eyes.