This link will take you to a .pdf file of the clinic about scratchbuilding a side for a 10'0" inside height Emergency box car, presented at Hindsight 20/20 9.0 on June 5, 2021.
Here is the link for the youtube video of the clinic.
Oops! I posted the clinic video to youtube a long while back, but never posted the clinic .pdf. That file has now been upoladed and may be accessed via this link. My apologies.