when you say hammer widebody, i assume you mean 124 not 126? if yes (124) then i have seen three others in photos, and they all look very simerler to mine, i think the front wings were hand made, ie std wings cut and an arch piece grafted on, and so all look slightly different, but the rear quarters were pressed as a whole piece, the flaring starts from the door jam, comes out, then the lip for the arch, then gradully goes back in and ends at the rear quarter joint. if you look from above, the car looks like an X.
by the way, there is a guy from uk, who posts on this fourum, who has a pair of wings and a pair of quarters, but no "kit" ie skirts, bumpers ect. when i pulled my kit off to weld/ repair the jacking points, i was going to make molds of the kit, so i could build another, but didnt due to wanting to get her back together before other things cropped up, and it would have been left to rot!
i will try to rig up some referance points and take some mesurements on the video for you to get as much detail as possible! i'm quite excited, i think the other coupe by barnstormer is fantasticly done, and looks good, but it is not atall true to the original lines. you should try to make the back flares flow out then back in.
i think the best starting point for somebody tring to get the original look would be sl129 rear quarters and rear bumper, i've often looked at them from the rear, and they do look simerler to mine,
i recon if you use porche flares, it will be able to be made simerler to original, hell, if you do it right, it could even look better, are the porche ones you got 80's style 911 turbo wide body arches?