I use ZAP slow cure (green bottle). Soften the viny with a hair dryer, apply a few small drops and press the parts together. Best to hit it with some accelerator. Once everything is tack-glued, you can run a bead all the way around (make sure the accelerator has completely dried first or you won't get good penetration.) Then spray with accelerator again.
These joints will hold up to most anything except being dropped, especially when cold. If you want to be really safe, fill the parts with plaster and use pieces of coat hanger with epoxy to make the joints more permanent. Make sure not to add plaster too fast as it builds up a lot of heat - like don't try to fill the whole model in one pour.
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