I'll be starting on the wooden handle section next
I think the handle should be made as a separate unit. From what I can see the 'grip' section looks slightly thicker compared to the base, so a slip cover that can be glued over the main rod looks an ideal way to go. It will also reduce the risk of damaging the base section while the wooden handle is constructed on its own. the slip cover (yellow section) is just an old hollow metal broom handle, it's a perfect fit over the resin base rod.
I FINALLY COMPLETED THIS PROJECT AFTER 4 YEARS. IT CAN BE FOUND HERE