Question: I'm setting up a projection map for a non-profit that will have images projected onto angular and unusually shaped walls. I use modul8 on my mac in the past, but this case is different. They use PC (in fact their whole show runs off of a laptop) and they want the ability to change the images based on the theme of the show. They have an A/V guy, but I don't want to suggest complex software that is going to be hard for a beginner to use. What software should I recommend and then use to set up their show so they don't have to keep calling little old expensive me?

EDIT: I should also mention that this is a small non-profit, so free or really cheap would benefit them greatly.

Answer: 
It is certainly possible to use FCPX and AfterEffects as part of the same workflow. To do this effectively, you will need to use an intermediate codec that preserves image quality across successive generations. ProRes HQ 422 is a good baseline as an intermediate codec. There are higher quality ProRes codecs (XQ 4444) and lower quality ones (ProRes LT 422). But ProRes HQ should be a good starting place.
While Adobe and Apple each link their editing software with their own respective compositing software, saying 'AE is to Premiere as Motion is to FCPX' glosses over the strengths and differences of each package.

Sure, AE is a powerful compositing app, and it's dynamic link to Premiere is convenient, but Adobe is still playing catch up to Apple when it comes to application interoperability. 

Say, for instance, you'd like to make a transition between two clips, and you'd like this transition to be a stylistic element of your production which you can re-use as often as you like. This is something at which Motion excels and at which AE struggles.

After Effects is more powerful when it comes to a lot of VFX work, and its scriptability is a powerful feature which is unmatched in Motion. However, I would argue that the "bond" between FCPX and Motion is stronger than the one between Premiere and AE. But when you're talking about using FCPX with AE, there is NO link and you have to render bi-directionally.