This certainly does sound most interesting, but those of you planning new fauna, please think through what you are going to make. Don't just smack 6 legs onto a cow like creature, tweak its looks and call it good. Consider why the creature developed the way it did, why its changes gave it a advantage over its competitors. In the above example there isn't a real reason for a large herbivore to have 6 legs, it would hinder it (Nature has weeded out six-legged creatures that are not very small [such as insects] over several hundred million years, as the 2 extra legs cause a drain in terms of both resources and energy on the creature far beyond any advantages they may provide [which would be minimal, btw]).
Also keep in mind that many of the really crazy things are not likely to be natural products of evolution, especially on the worlds being colonized. Evolution only cares if something work, not if it is the best at what it does (for example, tropical plants use a different leaf structure so they do not loose too much moisture in the hot regions. More temperate plants never developed this, despite it being much better, since it was not needed for survival). The only places the crazy, ultra lethal shit you see in sci-fi (the creatures from Aliens, etc.) is likely to develop are on hellish worlds where every creature must be extremely good at either killing its prey or preventing itself from becoming prey to survive. Given the apparent number and habitability of planets within the SARPs region of space it seems extremely unlikely these sorts of planets would receive much attention, beyond botany and zoology.
Lastly, consider how the introduction of non-native creatures would effect your new creation. Keep in mind that many of the creatures brought by the colonists where probably chosen specifically for the heartiness and adaptability, most likely further augmented by genetic or cybernetic modifications. This means that the new creatures being introduced where selected because they where amongst the best at what they did on Earth, which does not bode well for the native flora and fauna.