I was looking at an existing low profile design enclosure that had no venting, but I've found a derivative design that includes venting, but not low profile. Ten minutes with Tinkercad and I now have a low profile design with venting. It's on the printer, as I write.
I also did want to know the details about cooling for general reference. This is a Voron build I'm working on, and the PD7i sits just in front of the front door of a heated chamber, so I was concerned about originally having no cooling. Now, with the added vents to the enclosure I'm using, and from your comments, I will assume all is fine.
Thanks for your help.