Thanks for your reply Steven,
The guy I bought mine from said he'd researched this Charly and claims it's one of twenty genuine convertible units All-Cars made, I've looked on some Italian websites and can't find anything to back that up. It looks like the green convertible Tobrouk models you referred to but it's definitely supposed to be that orange colour. The gel coat in places is chipped and it's orange through to the fibreglass. There's 4 mounting areas on the back bodywork where it looks to have had a tubular framework just like the green Tobrouks. This is long since gone. There's nowhere to mount any doors and it looks like the loops you mention on the A posts were to restrain canvas doors. The bodywork also has press-studs along all the edges where a canvas top should've been, again, long since gone. I received no paperwork with the Charly as the last owner bought it from a deceased man's estate along with some other quirky cars. The only history I have is I found a photo of my exact car on an Italian website and I know it's mine as the chassis number is quoted. The picture is from around 2012 and looks, as far as I can tell to be in the UK.
As for modifications to mine, I'm not sure as they all seem a bit bespoke to a degree, mine has a Franco Morini 50cc engine, looks like it's a TA50 / TA4 - GS water cooled unit with Malaguti engine covers on it, so I'm saying that's not original. It's got a radiator bodged into the rear, right hand mudguard with a pump in the piping with nothing driving it. The engine is missing it's piston, although the bore looks fine. It's engine flanges have been cut and widened on the rear axle to take this engine, badly! There's no belt drive, the engine drive sprocket has been removed and is lined up with the input shaft of the differential, with a rubber coupling between the two, again, very poor quality welding and workmanship. My clutch is not on the gear shifter, there's a clutch pedal just as a conventional manual shift car, but it's in the passenger footwell. I have two handbrakes, one is a handbrake, one seems to switch the differential into reverse, which I assume gives you all four speeds going backwards as well - I bet that's scary! The restraint bar you refer to is not present on mine, which I'm sure adds to the terror, actually, re-reading your post I think that's the windscreen rubber, it's just resting over the seats. I have the windscreen, it's been removed whilst the previous owner worked on the car, I think they lifted the whole body off of the chassis.
I don't know if it's standard, but mine has a Fiat 126 started motor in a bracket on the rear axle, which indirectly drives the kickstarter shaft via a idler sprocket to reverse the motion, again all very amateurishly done. The start motor is cable operated and the switch is integral to the motor. The air ducts in the side should have Fiat 126 air scoops feeding through them.
Lastly, the seats are not standard and anyone in the UK who uses public transports would think they look familiar. My wife thinks they're bus seats, I think from the colour they may be train. Either way their framework is not secure to the body, although they do look like they were made for the Charly, with contours lining up as if they were made for the job.
I was hoping someone might know the car, or have an idea when it was manufactured. I've no idea how it ended up in the UK, how long it's been here or if it can be put on the road.
This photo may help:
https://www.dropbox.com/s/7c7l4utdww05a86/20171008_123059.jpg?dl=0