I keep 6 min and 30 min Epoxy on hand. Plus thin CA and Thick CA. Use the CA for frame and wing work. Thick Ca to fill gaps. Thin CA for sheeting and wing Ribs.
You must also have CA Acellerator and CA Debonder (becareful with Debonder this stuff will desolve nylon jackets. ) The Acell is necessary for Thick Ca to set quick, also can help thin ca to bond to hardwoods.

Use the epoxies for shock surfaces like firewalls, wing joints, landing gear blocks. I use the 30 epoxy for tail fin mounts it gives plenty of time to check alighnments. Use epoxy for hinges. Ca will not hold plastic and pin them with a wood tooth pick. Keep alcohol handy in case Epoxy gets in the hinge.

Also, use 90% alcohol to thin epxoy. I thin it and coat the firewall for a perfect fuel proof coat. Plus I use a thin mix to coat fiberglass taped wing joints. Been doing this for 20 years and works great. Water glues are a no no with balsa. It causes major warps.