She looks pretty mint man ??... hell of a score. Cant ask for more than mirror quality seams. With that clarity id say its newer than i initially thought or was kept on a good stand. The “old work” on it seems pretty textbook also. Just looks to be an overflow that was cut out and patched up properly. Aside from a good cleaning, dont think shes gonna need much tlc past that. Depends how much u want to buff it if needed. Can get away with just 3 sides. If u paint the back itell hide any scratches on that panel all together. Ive sanded paper off the bottom of tanks, left it rough, painted and it looks clear from the inside. Novus or car polish for plastix goes a long way. Itell shine er up and hide most scratches. Can always start there for pretty cheap/easy. It wont remove any large gouges Or scratches like sandpaper but might make it look good enough to forgo any sanding.