Sorry, with you now. So is the car just a tin top at the moment? In the early days a sunroof Beetle was like this from the the pre war prototype up until the 60's, there seem to be a few companies listed on a Google search
Nice, although I will leave my 72 1302LS auto as it is. It would have been nice if the previous owner (there was only one before me) had ordered it with a factory slider; he bought it in Germany with British Army discount and ticked all the boxes except that one.