[JohnAh]

I'm not skilled with the pen but I played a little with a curvature-whatever (...it's called in english) just to get a hint of what my latest ideas would look like.

The first step is to create something like a station wagon out of an old trunk hatch so it can be detacheable. The upper part of the "station wagon adaptor" will be slightly larger than the rear window to straighten out the bent roofline a bit. Since it will cover the window entirely I don't have to remove the window, but since my large dog have complaints and I don't like the idea of double rear windowns I'll most likely remove it.

The station wagon adaptor will have an entirely flat surface in the rear end, with a small door and a window to make the trunk accessible from outside. The original rear lights will be left in place, all I need to to is to modify/extend the rear fenders to give a flat surface in level with the SW-adaptor.

This modification/attachment should give some Kamm-effect superior to the sofly rounded original 96 design. To really get to the extreme I can then build a second extension that is hinged to the roof of the first extension. This part will be like a fiberglass bucket, or even be a quite massive part with a core of expanded polystyrene. To make the car easier to park I can have a mechanism that allows me to raise the tail extension over the roof, exposing the rear window/door and making the car a lot shorter. If I need to use the hitchball or go somewhere were I can't have the tail at all, it is easily detachable, exposing the original rear lights fully. With the final extension in place, the original Saab rear lights will still be partly visible, mainly from the sides, marking the width of the car seen from straight behind.

The best thing is that I can do this crazy thing in two steps, making the project less complicated.