I have done this.

No it is not

Does anyone know if there is a voltage limit to the fans power socket?

I have successfully changed the hard drive to ssd in mine

I solved this problem with small white snap clips that you would use to hold auto plastic together

On the whole screw thing. I just used a tiny dremel drill bit and drilled out the security pin. I hate those screws. I don't see the point in locking the them with those. they should have left the screws alone.