I'll try to address questions as we go.
Strength: Not going to be a problem. They'll be made from a solid billet, it'll be heat treated material, and if you see in the drawings, there's MUCH more material than in the stock setup.
Weight: Estimated at 3lbs each BEFORE machining! They'll be far less after.
Firm cost is unknown at this point, but around the $350us mark for the pair (with bearings, studs, and seals).
Caliper brackets could be an option. They'd have to be stock units that were modified (send in your old set as 'cores' along with payment for the calipers - you get back a bolt on setup type idea - maybe even a complete package with calipers & pads too - or different option levels).