Kindest thanks my friend!
What an unbelievable battle with the body of this little beastie! I thought it would be so simple; get a beetle and chop the top off as per the TV show. Ha!!
Finally just about have it straightened out with the myriad of alterations. Then to add the (presumably) canvas cover over the area behind the back seat. Used 0.015" strip for the edging, then 0.005" sheet for the rest.
Then, following photos of the actual thing, mark where the bolts/snaps/whatever they used are located, drill holes with a #74 drill bit, insert .020" rod, trim and sand to shape. More primer, and now I'm finally starting to feel relieved!