The tank I picked up on e-Bay a while ago. I don't remember from who... They are on there often, so it's not hard to find. The sump is from JEGS and that was about $60. THEN another $75 to have it professionally installed by a trusted radiator shop out here on Long Island. I finished it off with a few coats of Krylon hammer-tone spray paint. The paint gives the "hammered" effect when applied. It's sold as paint for outdoor metal furniture (so it *should* hold up well) and cost about $6-7 for a can big enough to do the tank and more....
Thanks for the bicycle inner tube suggestion. Good idea!