[primitive]

The fastest expansion: EB (1 turn) build Colonyships only at HW for the first year. Settle the closest moons and small planets with 3 or 4 of them very early, building Shipyards (and maybe a few Rad and Org facilities). These will be available in time to take over production of colonizers when HW goes to slow.

Also send 2 or 3 of your first colonizers on landgrab expeditions, leapfrogging a system or two to make a base for further expansion. When you find a cozy system, don't go for that big breathable but colonize a small useless planet first and make a Shipyard. First build for this should be another leapfrog colonizer.

Compared to the BSY model, you will have more building capacity (and colonizers) after turn 14 - 15. You will also be spread out more, having grabbed more systems for yourself. On the downside, you will be very vulnerable against the rush if you got baddies close.