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Originally Posted by Weather Spotter
aerohead, nice summery and comments.
I might make the end panels per the suggestions, how long? Can I make it come to a point?
I might do some tuft testing when it warms up. Most modding has come to a frozen stop 
As for the sides, I need to do some work on the transition from car to tail. Right now I have it changes angles twice, at the car and at the top end of the window. The angles might need a bit of work but that is fill in and finish stuff, on hold till temps are 45-50F (mid march).
You are right in that I decided for the squared off shape due to the labor needed. To be totally honest I only sketched it out, most of the design came during building phase.
I may do a mid section belly pan, But I need more material I am out of any good sized colorplast or sheet metal. It is also easier to get under the car without winter gear on.
If I do 3 season mods they will only be on for 6-7 months a year 
any tips on reducing Styrofoam squeak? |
I think the panels could be as short as the depth of the original bumper offset,maybe only 100-125mm or so,and no taper at all.They're just going to get the flow going straight back and when separation occurs,the mass/inertia of the entrained snow/water makes it more difficult for it to rotate back with the air and stick.Some cardboard and duct tape could 'prove' it or not.
On my T-100 boat-tail I've got a simple cedar wood shelf sticking out which helps spoil this flow,as well as protect the protruding license plate lamps/tail lamps,and reflectors.Mercedes used to build these shelves into their tailight covers,to help turbulate this flow and prevent 'settling.'
My shop has been 34-degrees F lately,I too await warmer work conditions.
As to the squeak,when I did the boat-tail on the CRX,it was a fiberglass shell which slipped onto the back of the car like a glove.To help protect the finish,I would tape felt at the attach points of the body,and when the tail slipped on,it would capture the felt at the interface and there was never any squeaking.I don't know if something like that might help or not.
You might be able to attach a thin plastic or sheetmetal 'starter' to felt and wedge it into a temporarily loosened area,pull the fabric in,cut off the starter,and re-secure the fasteners.
How about Velcro-fastened wheel fairings which can be yanked and replaced as weather dictates?