s.bernbaum
Mostly lurking
So are there any decent guides on the space race out there?
Look in the War Academy. I know that there is a guide there for space race victory in an OCC game, there may be a more general one as well.
How many of each part do I need to build to make sure my ship gets there?
If you want to be sure that it gets there, you need all five of the casings. Each one that you are missing means 20% more chance of failure. You need all of the components that are only one of a kind. You can launch with either one or two engines. With one engine it will take more turns to get there. So, if you can plan things so that both engines are finished at about the same time, two are better. If not, then compare how long the trip will take with only one engine to the time needed to build the second one. Often, it is faster to just go with one in that situation. You can launch with less than all five of the thrusters but I have never done so and have never seen anyone comment on what happens with less than all five.
The only other comment I have would be that unless you are able to build the space elevator using engineers, it will take so long to build that it will actually delay your launch because you can build several spaceship parts in the same city instead in less time. Space elevator was good in vanilla but in BTS they moved it to a tech so late in the tree that it causes this problem.