Those feats are brilliant, and i will be adding them amongst the list of new feats in the Character Profiler - Core Rulebook III. also, the core mechanic about Mako Points and the Limit Gauge will be added to version 1.15 of the Core Rulebook I.
as for your sheet, Trace, it looks good so far. and yes, it is a materia necklace, but the purple materia orb is broken in two.
Trace