CA's and epoxy is quite different. Most model epoxies use a 50/50 mix but there are many others where the mix is different--less activator per unit volume. note that all epoxies, even the 5 minute type still require 24 hours under normal temperatures to reach full strength, it is just that the faster rated epoxies become tack free sooner (and make poor connections sooner if you let it start to set up before using it). The slower epoxies do form longer polymore chains and are thus stronger than the faster setting ones. And yes, CA's can cause health problems. Unfortunately they are cumulative and can sneak up on you after extended use. For most modeling work, especially for fastening wood, carpenters glues perform as well or better than either CA or epoxies with joints stronger than the wood you are joining together. I've put together many 1/4 scale planes with no use of either epoxy or CA with no problems, yes, even the firewalls using only carpenters glue, usually Titebond.