Thats a great outcome
On the SOTA you shouldn't need to do a complete upgrade.
The Nova already has the AC motor with double regulated frequency synthesised power supply - this was a massive improvement on the older DC motor.
I prefer the original bearing ( inverted bearing with sapphire thrust pad ) if its in good condition. When the Sota is transported you must use the transit screws to lift the platter off the sapphire thrust pad - most damage is cased by transporting without the transit screws. Secondly make sure the bearing does not run dry.
If the original bearing is good - you could do the springs yourself.
You could get a basic service - new springs, clean and lube the bearing, check all the vacuum system - hoses, gaskets etc - the air pumps should probably get the internal rubber bellows replaced due to age.
Just bring the Nova up to as new condition - its still a great TT.