With those upgrades, I reckon you’re offering it to him at maybe 50-60% of its value open market. I’d expect to get maybe £450 for a deck like that? A bog standard P3 can fetch £250 easily. £350 would be a ‘doing a good mate a favour and not feeling like I’ve shafted myself’ price I reckon... how much do you like him?
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Before you criticise a man, walk a mile in his shoes. Then, when you do - you'll be a mile away. And have his shoes.
Wavy grooves go thru a RigB 540ML on an SL1500C. Digits stream from a cheapie CDP and a Sonos, into a Yamaha 803D driving Kralk Audio little 'uns. I used to have a Linn but I'm better now.