Hi.
Have a look at
http://amiga.resource.cx/photos/photo.pl?id=a3000tYou'll find a VERY high res pic of the A3000T motherboard there, 5432x4092 pixels. That should give you quite a few hints as to where the chips go ;-)
Anyways, best of luck with your build-your-own A3000T kits :-D
regards,
Paul