A1200 HD in external case with USB to laptop with Amiga Forever?

[Jope]

Yes.

The version of WinUAE is usually not very recent in Amiga Forever, so you might want to download the newest one from www.winuae.net

Then once you've started down that road, you can forget all about AForever..

Use the AForever kick roms or the ones from your A1200, then copy the Amiga's HD contents to a virtual HD on your PC.