Nice pictures of that frame, looks very basic though, and interesting esc placement especially for U8 type motors... Hmmm, U8 170kv 6s x12 is max thrust of about 125lbs...
I'm a fan of the x12...
Use Channel 8 for retracts... also read this. It will help
http://multirotorforums.com/threads/basic-setup-instructions-for-frsky-taranis-x8r-and-naza-m-v2.15482/
I have a love hate relationship with servocity... it gets expensive, their servo mounts are top notch though. I have built some random stuff off that site... lol
The confusion is if you are using it in D8 1-8 mode then the 8 SBUS channels are mirrored on the 8 outputs. if you want separate 9-16 you will need to select it when you bind the Rx. Most of the time I just bind like this and pick a channel I'm not using anyway... then no need to mess with 9-16...
Most of all of us found this^^^ out the hard way, @Lynn Deppe, you should be lucky it wasn't more expensive I have purchased quite a few products from HK that were far less than satisfactory. Haven't ordering anything from them in at least 2 year but I did get a great deal on a Turnigy...
DYS BLheli esc line have treated me very well so far, and run much cooler than the ztw spiders did
(full disclosure it was different motors as well) although same size motor and esc
I know it's a little late but maybe look into some of the 250 power distribution boards, they will have 5v out for FC and usually 12v out for lights or Video Tx... Worth the weight in my opinion, probably a weight saving over 2 separate UBEC...