Finally got all the parts happy together. Ended up with a combination of several components I had not tried before- a Pololu 18v7 motor controller plus a relay for the lights. I had to add some code to the PT receiver but I think I will keep that as a configurable option from now on. I tried to use an old soundraxx sierra board but it just didn’t work very well. So I also added an old soundtraxx tsunami which gives the ooh-gah sound but unfortunately only diesel locomotive prime mover sounds. The speaker is a tiny 2 inch visaton-frws-5-r-2-fullrange-speaker, but it sounds pretty good.