Hi Stephen,
I also have a VGN-G11VN, still going strong - andam looking to upgrade to an SSD. I am not awareof the above issues, but Ihave had the case apart. Just get the specson the HDD - which is a 100GB MK1011GAH toshiba unit (system/devices) The datasheet for that series says its a ZIF/LIF PATA 40 pin.
You might already havethat info though. 1.8" HDD USB enclosures can be had for about 5 GBP from ebay - useful if you intend todo a more leisurely migration.
I still have XP installed, and am wanting to go to win 7, which I see you alreayhave in place. Any issues in installing win7? how is performance compared to XP?
I see here that Sony only provide an update package for win7, no driversoranything else. What about drivers? motherboard/graphics particularly?