If you do the math you might find the modifying route isn't cost effective. I had a p25 which I looked at modifying but in the end decided to sell and upgrade instead. By the time you've bought a sub platter £100, db plinth £250, Platter £100 (or £200 for the delrin) and double pulley £35 you've spent the thick end of £500 and you still have the motor to replace, personally this is madness when you could pick up something like a Nottingham Analogue spacedeck for this kind of money and use the sale of your p3 for an RB300 derivative.
This is close to what I did and have never looked back, I tried a few of the mods first and although it was an improvement the moded rega will not sound as good as the NAS. The NAS looks better and will retain its value unlike the db2 which looks homebrew (you will tire of its aesthetic). A bastardised p3 will be hard to sell on people like to buy original kit.
If you really want to go down the modify route then as others suggest there are better places to start than the plinth. The sub platter and double pulley are the place to start, I found the achromat made the biggest difference which can be had used for about £35.
Replacing the stock feet for some quality sorbathane ones on a solid wall shelf will give most of what the new db plinth will IMHO

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