Chuck,
It's honestly been a while, so I don't quite remember WHY I changed what I changed, but I'll try to further explain.
At the back of Blood and Circuits you had some data about "buying" Invention Points worth of gadgets using the Blood and Vigilance points. If I remember correctly, originally, this granted so few points that at 3rd level a "gadgeteer" character would have enough to invent something along the lines of a Desert Eagle ... I.E., nothing very big or wild.
So what I did was ignore taking a point-granting background in B&V for the gadgeteer, and instead took Advanced Training (the extra skills'n'feats origin) and built the character THAT way, just going nuts with Smart levels and skills.
Then I used the regular Blood and Circuits invention point system for the "gadgets", letting the character roll and buy raw materials as normal.
The character was sort of a Doc Savage PC, though, instead of Iron Man. Where Iron Man invented one big thing that was his method for super-heroing, Doc Savage's heroic ability was in his plot-ruining ability to just be That Much Smarter Than Everybody Else. I.E. more about the inventING than the inventION.
--fje