Vintage upgrade

Hi, everyone. I am new here and relatively uninformed about much concerning TTs. I have a 40 yr old JVC belt drive manual w/auto return that I have used on and off over the years. After considering a new TT, I decided to try my hand at upgrading this old dog, which still preforms well, before trying to justify a rather large expenditure to the wife.
The first thing I did was take the platter to a local machine shop, where it was re-surfaced and the spindle was tweaked. This virtually eliminated what had been a rather severe up and down wobble due to a bent spindle. My next step will be a new mat. I'm leaning towards a Herbies Audio Lab, Way Excellent II. Next will be simpler things like ensuring proper alignment and balancing of the Blue Oyster (?) stylus on the old JVC S-shaped tonearm.
Some things I have considered are a new suspension in place of the old springs on the corners of the chassis and a new motor. The 40 yr. old original has a slight hum. Not too bad for my ears, but the idea of course is seek perfection without actually paying for it. My problem, motor wise is that there are no identifying marks or lettering on the original and no info from JVC for something this old.
Ideally, I would eventually like to build a new base to accept the existing chassis and also isolate the motor.
I will do all this and more unless I receive an avalanche of protest from the more reasoned minds on this site.
Finally, any suggestions? Or is this a waste of time. I love the ol' girl and would like to keep her happy.
(talking about my wife, here.)