I looked for a great rebuild of a 301 for many years.
When I finally found a Woodsong 301 in their highest level plinth and $3500 Jelco arm I was v happy to buy it for $5300. You might ask for advise from Woodsong, but Chris Harban is great at what he does and not cheap. But he is a v nice guy and I’m sure will help on the phone.
The original price was $12K. To do one on the cheap is possible, and possible to get pretty good sound.
I have seen nice plinths on EBay for a few hundred. The Denon 103 is a very good cartridge for the price. You might also look at Grado. A better arm is a good idea.
Do you have a phono stage or preamp with a built in phono? This is probably where the lion’s share of your money goes.