I'll assume it's the 1/4 scale (74") Cap, not the 80"?
This is a great combo, you will love it.
Keep it light! don't dump a lot of extra equipment in it. Get the carbon fiber gear, thin walled spinner, 5 servo's with a "Y" or bellcrank on elevator, throw away the wheel pants, single battery pack, small screws.....
The wing dowel mounts tend to open up, double them up with some light ply oriented 90 degrees.
Throw away the Sullivan metal control horns (with the poly inserts), they wear and create slop in the linkage. Replace them with Robart nylon.
You may want to glue some triange stock to the back of your firewall, or glass it. If you do a lot of 3D the firewall can fracture at the side and come loose/off. This has happened to me twice but that was with a lot of hours on the airframes.
Check your incidences and washout/wash-in with a digital meter. One of mine came out of the box with +2 in one wingtip and -1.5 in the other. The plane rocked like crazy in the elevators, when I reset the incidences it smoothed right out. It should be tail=0, wing=0, motor 2 deg. up and 3 deg. right, 0 deg. of washout.
I've used spoileron/flaperon mixes for harriers and elevators but if it's light enough it doesn't need it.
If you can keep it at 11 pounds with fuel this combo will out perform almost anything twice as expensive.
Do a search for Hangar 9 Cap and you'll find lots of great threads on this one. Lots of guys (and moderators too) have been permanently warped by this plane. We usually end up buying lots of Cap models trying to find other verions that fly as well.

Chris