See these two files:
https://www.dropbox.com/s/gprnicar0z...CTC38.pdf?dl=0
https://www.dropbox.com/s/qmbld468nb...CTC38.pdf?dl=0
Those two files have about as much info as you're going to find online, on the CTC38 chassis. I found the original documents on eBay - the scan quality is about as good as I could get it with my inexpensive 11x17 scanner. Sorry for the huge file size, but I think you'll find it worth the wait if you have a CTC38.