This proved to be quite a challenge to get right, because it is curved in all three axes, and in the end was a compromise between what I wanted to do and what Genie would let me do.
I thought I'd post it here in case anyone was bored and wanted to figure out how they would construct the window. I used mostly lofting for the actual window, but lots of small sweeps may also work.
In case anyone wants to have a look (only the 3d object not any profile nor materials), I put the file on my site
rather than take up space on the forum, one for v20 Pro (ACIS) and one for 2016 deluxe.