Just remember to pick over, under, and inside where you can your frame for cracks and areas of weakness - Think of yourself as a good dentist or better still an oncologist... I started working on a frame one time to find out that the only thing holding the frame together was the rust...
Rust can be very humbling and often can win the battle...
Further note: One UO-8 I worked on was so severely surface rusted after sanding that I used a "Hammered Finish" paint to repaint it - The small rust dimples are now covered and hidden completely...