I would recommend using the low temperature hot glue. I've used it on several resin kits, and it hasn't been a problem with respect to damaging the body.
I am curious as to whether anyone has used this technique on the vacu-formed bodies, particularly the Rodd.com kits. The bodies seem much thinner than a typical resin kit. I just want to be sure I'm not going to melt or deform the kit using the hot glue.
Sean