You are absolutely correct it is right on the edge of possibility.
I have been playing with the Sheet, Rotating the Body and timing the processing.
Extruding was taking 02:00 minutes and Rotating 90º was 02:33.
The movement of the Body during Rotation was normal until hesitation was accepted as the new position, then it became coffee time. Although this is not intended to be a negative remark but rather an acceptance of limitations.
In my view Users need to ask themselves how much fine detail is needed.
The size of the Gate as drawn means that the Holes would appear little more than a shade or texture.
A fully finished Design would need a mighty big Screen to show it off properly.
Displaying a close up of a small area seems like a reasonable solution?
Sorry to hear that the Download is proving to be a problem. If you are using an early version iPad it may be on the limit also?
I found the experience interesting, it did not take too long. I had a meal and an hour long telephone call so not all the time between posts was spent on the iPad.
I am satisfied to have reached the limits of what I consider to be comfortable S3Ding.
It has confirmed previous findings but within a practical requirement specification.
I always find doing something that you have never done before is a good grey matter exercise, and as always practicing make progress toward perfection.
Thanks for presenting the opportunities.