assembly an internal microfone A31; possible? howcan do it?

[OMNIBUS]

hallo
i have a TP A31 2653 model with ultraport on the screen that i will use with an ultraport web camera that hasn't microphone; even the A31 hasn't an internal microfone, as about all tp, unfortuately! so i need every time i use skype, or similar, to connect an external microphone using the jack 3,5 connector !
can i connect some microfone 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?( would use an external microphone if i need it just putting in 3,5 jack conector 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 particulare place?
every little microphone is good to do it or some particular ones?from whic tp i can pull out...i have 390, 390E, 390X, 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