You know, if the retrofit into a completed wing is easy, it may be worth considering as well. The install of the kit in the floor was pretty straight forward, and it all goes together easily (mostly), but a couple things to consider as you make your choice:
1. The fuselage floor bay was a little bit of a PITA to work in (tight space, as I had wires coming in from the wing and had to trim the mounting bracket a bit on one side (could be different for you, depending on where you are in that part of the build, and how your wires are run).
2. At full throw of the aileron, the servo arm contacted the edge of the lightening hole through which the aileron push tube exits to the wing, so I had to trim that hole back a little. Not a big deal, and that may not happen in the 7, but something to be aware of.
3. Dynon's recommended attach method for the bracket is through the floor, with an outer plate provided to sandwich the fuse skin from the outside. You can also attach the bracket to the floor stiffener (through the side of the bracket), but it felt firmer to me to go through the floor. so I painted the plate and drilled away (after gnashing my teeth a little about drilling 4 more holes in my belly
). If you haven't painted yet, no big deal...but it will stick out a little (unless yours in an A model...I believe Dynon says it'll fit under the top gear-leg fairings in an A).
Caveat...not an expert on this at all...just some experience from my first AP install. Just wanted to throw it out as you look at your options.
Cheers,
Bob