[Big Dave]

Talking about end conditions is little premature until I get a section I like. It looks like the duckbill+3 plates keeps the flow attached the best.

Probably the aftmost plate will have solid sheet metal supports on the ends (sides?) You can’t see under that plate anyway.

The intermediate plate (or plates) will probably be supported by struts. At first just threaded rod til I can work out angles and heights. The whole point is to have some visibility to the rear and to the quarters.

The duckbill will get a tapered side support.

The duckbill worries me. In the sims the duckbill does not even begin to turn the flow and we get separation.