made some progress......
to make the rear hump i waxed a bucket which was close to the dimensions i wanted, then poured in a mix of 75% bondo and 25% fiberglass resin (to eliminate any bubbles and for a smooth finish), when that cured i layed in some fiberglass matting and more resin. finished product is a panel which will require minimal sanding

cut it down and duraglassed it to the seat pan part in the position i wanted.
i'm going to use 2 round taillights which i'll cut into the rear of the panel.....and i'll be molding/shaving all the lower edges as they aren't perfect.
i also need to fill in the rear so it doesn't resemble the bucket or a small keg LOL
a few pics....