I think this is one of the easiest ways to beat higher AI difficulties or to pick up AI types achievments. With the harvester upgrades and 8 HWs of resources, you can make two chokepoint planets pretty strong pretty fast. However, if I did it again, I would probably do 7 HW out of 10 so that there is at least one non-AIHW planet to pick up a Fact IV, ARS, Golems, etc, before having to crack the first homeworld. Mk I vs core is not pretty...
...I had to use a lot of nukes just to get a presence on each planet, though that may have been partially due to the core beam guardian covering the entrance wormhole. The second HW was easier once I controlled all of the manufacturing buildings on the first one.