Thanks everyone! I posted an update in the "testing" section with his full scores, but forgot to update this post. He took the SB-5 and results were below a technically gifted FSIQ. He was sick at the time of testing, and there's quite a wide spread in his results so I think we will re-test in a couple of years, and seek out a school with facilities for extension anyway.
Fluid reasoning 14 (91st percentile)
Knowledge 10 (50th percentile)
Quantitative reasoning 13 (84th)
Visual spatial 18 (99.6th)
Working memory 13 (84th)
Verbal:
Fluid reasoning: 16 (98th)
Knowledge: 11 (63rd)
Quantitative reasoning. 14 (91st)
Visual Spatial. 15 (95th)
Working memory. 19 (99.9)
FSIQ: 128 (97th)
Verbal: IQ 131
