Upgrading the iMac G4 + Other questions

I am very very fond of these type of iMacs so I am looking to buy one from ebay!
I was wondering if it is at all possible to:
A. Upgrade the video memory to 256mb
B. Upgrade the processor to a Intel Core 2 Duo (If so, how?)
C. Upgrade the Bus Speed
Will the Airport card that supports 802.11n work with this iMac?
Also, I am a little uncertain about this so I will ask... Do these have 256mb of RAM already built in? So you can add addition RAM too? What is the most RAM it can support?

Hello and Welcome to Apple Discussions.
I absolutely agree. It's a real shame that they stopped producing this design. Still I've got my spares ready to keep my 20" going and it's easily fast enough for Office/Internet use.
kind regards
mrtotes

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<Post Relocated by Host>

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Upgrading the iMac G4 + Other questions

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