A31:to build an integrated internal microphone,how?

[OMNIBUS]

hallo
i have a TP A31 2653 model with which i use with an ultraport web camera that hasn't microphone; the A31 hasn't an internal microfone too, unfortunately! so i need every time i use skype, msn, to connect an external microphone using the jack 3,5 connector !
can i connect some microfone for example pulled out from other TP and doing a little hole on the palmerst or on the lcd screen lid that i think it is better to avoid fan noise?
where can i connect the 2 (red and black) microphone's wires? how?( i would be able to use an external microphone if i need it and if i connect it that should excludes the internal microphone as happens in all TP)
which is the best place to make the little hole? lcd internal plastic lid? or palmrest bezel? some other particular place?
every little microphone is good to do it or some particular ones?from which tp i can pull out...ithought from 390, 390E, 390X, or T20, T21, T23, R50 moteherboard with bases and microphone for spares to pull out...which is the best microphone?
i'd need a software adjustement too?
any suggest is apreciated
thankyou