I had a Hog built and the manual/plans/etc got lost in the mail on the way back. I sent an email to Sig on a Sunday afternoon and by about 10 Monday morning had this response back.

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Hi Carrell,
Thanks for using Sig products.

The CG is 3-5/8" back of leading edge at the root. Have model inverted.

throws:
Ail- 3/8" up and down
Rud- 1" left and right
Ele- 3/4" up and down

For the OS 70 use the 13 x 6 prop.

Regards,
Justin Van Dee
Sig mfg.
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I am very impressed that they got the info to me so fast.