I have been talking to the designer and he has been looking at incorporating some of your comments/suggestions as follows:
* In response to AQM's post, well spotted! The front nerfs and frame indeed came from a Cobra. It looked ideal 'if you can't beat them, join them!' and is much neater than those ugly black plastic bumpers on the MG roadsters back in the 1970's.
* A short narrative about the first rendering. The seemingly black surfaces of the bodywork are actually carbon fibre. There are LED DRL's integrated vertically into the front mudguards. They have a flush look. And no all-weather protection for now though (David - this is where you come in with your shower curtain option!

).
* It is technically possible to make it a 4 wheeler. The attached and hand drawn mock-up shows a single arm rear suspension on the BMW bike. One arm could be used to support one wheel either side and the rear track is very narrow, similar to the 1960's Isetta BMW bubble car. Both arms swing independently on a common hinge attached to the rear of the tub. Since the BMW bike has shaft drive, propulsion of the rear wheels from the twin engines is via a shared transfer box splitting off in two shafts, driving one wheel each. The upside is that it now boasts all-round independent suspension! Genius
* The rear of the bodywork is widened to provide for the twin tyres and fuel tanks. Lengthwise, it resembles a wasp in profile.
* You will notice that thing lurking at the extreme rear end in the sketch. It is a venturi effect splitter neatly integrated so it does not detract from the Trad looks. Fitment of a spoiler would be the ultimate sin and spoil the looks of this classic car.
* The rear of the bodywork is widened to provide for the twin tyres and fuel tanks. Lengthwise, it resembles a wasp in profile.
* You will notice that thing lurking at the extreme rear end in the sketch. It is a venturi effect splitter neatly integrated so it does not detract from the trad looks. Fitment of a spoiler would be the ultimate sin.
These improvements have been incorporated into the following hand-drawn version:

Again, we welcome any further suggestions so that we end up with the ideal
Mansory-ed Boshly Morgan Three-wheeler Mk II - I know that having now got 4-wheels Graham will want 4-wheel drive...