I wasn't quite happy with how the colony buildings system worked previously, so the past month has been spent improving, adding more depth, planet randomization and decision making to it.
Planets now have up to 19 tiles which can each contain one building. This is similar to how planet tiles and building placement works in the games Galactic Civilizations and Stellaris.
Below are screenshots of the interface window for viewing empty uncolonized planets.

Many planet bonuses that previously affected the whole planet have been changed to tile bonuses, which only affect the building on that tile. The chance to spawn particular tile bonuses depends on the planet type.

Buildings wont have upgrade slots anymore (Previously mentioned in this log: viewtopic.php?f=3&t=47) But there are now more individual building choices to cover the effects of the removed upgrade slots.
Most buildings (such as Hydroponics, Refineries, Shipyards and Research Facilities) have levels that can be upgraded.

Certain buildings will provide neighbor bonuses to the tiles surrounding them, so the tile layout of the planet and where you decide to place buildings will be much more important.

Planets with a large amount of tiles plus a good layout of tile bonuses are much more valuable now!

This next month will be spent working on the actual colony screen for constructing and upgrading the buildings for each tile...