Funnily enough I was just looking for a frame similar to the Merida Reacto, I'll definitely be keeping this one in mind, looking forward to the build. Can I ask how you were able to work out what stem height? I have been hesitant to go straight to an aero frame for a build as with most other types of frame you have a bit of leeway with where to attach the bars. For this reason I might end up with the A8. Enjoy the build it looks like a great frame!