welcome to the forum. fixing up an old bike worth it? depends on what worth it means to you. I recently put a bunch of money on an old khs aero comp frame, the reason? it is a steel aero frame... no one makes a new one like it and I love the way it looks... I stripped in down to the base triangle, painted it, added a carbon fork, threadless head set, new stem and bars, upgraded the group to ultegra 6800 with an ultegra wheelset and I have a one of a kind aero bike... it rides very much like my 2015 propel, just a bit softer....is it worth money and time I have in the conversion? not to anybody but me.