starter motors are in the same place and the front 16v bracket bolts on with the starter using the same bolt holes, so thats the same place as 16v.
The AGU will also have 4 bolt holes on the rear with nothing in them that the rear bracket can bolt to, its almost like vw want us to do the conversion
you may need to push a bit of braided piping out the way but its a pretty minor issue
All that needs modifying regarding mounting the engine really is removing the old mk4 side mount which is just a couple of heavy duty bolts
If you get stuck with the wiring try sending rubjonny a pm, he's made quite a few looms for other people and is always ready to help out others.