Dennis O'Connor wrote:
Have you flown an aircraft with the door off, before this?

Yes. Skydiving operations. Cherokee Six (rear and baggage doors removed)
and Cessna 180 (right cabin door removed), Cessna 182 (right cabin door
removed).
I do not recall what the limitations are, so I was hoping there was a
website where they could be found. I know there are some oil canning
issues in flight with the door(s) removed on some aircraft.