Doug, you're likewise welcome to copy/paste this response.
On a different forum, another had a similar thought, wanting to fabricate removable panels. (Removable panels on a '60? Neat idea really.) Best one can do is give guidance so it was suggested he find proper Superior (Pontiac) sail panels and '59-'60 non-Crown landau irons (which Superior continued to use on removable panels through '70). The idea
could have worked/looked good.....until he gave up searching and did this.
Ended up having fixed panels that were mickey moused with proportionately too long S&S landau irons. Glass was removed entirely. Absolutely no sense of design whatsoever. Know what happened shortly after project 'completion'? He lost interest and sold the mess, leaving next owner to undo mistakes on a likewise fairly rare and desirable coach. Of course on top of that he felt the need to bring up money spent "customizing" coach (which in fact wasn't customized, rather
personalized - a common misconception).
The new '60 ambulance's owner hearse/mild custom personal decision is fine but let's hope corners aren't cut and more thought goes into process.