Evil, I am looking at an integrated master cylinder reservoir, like a Corvette or Z28/Trans Am. It should a low enough profile to fit under the hood and then I don't have to run extender lines. The key thing is to go with a larger piston to reduce the pressure somewhat from the stock Cobalt set up. Plus having the smaller single diaphragm boost should make the brake pedal feel 'normal' and reduce the chance of brake lock up if hitting them hard.
I will be running a separate clutch fluid reservoir, bought a 6.5 oz. from Tilton that should mount to the firewall near the clutch master cylinder..
The 7 inch booster is an aftermarket, not a Chevy part. The brand is MBM and PN PB7001, bought off eBay. This booster will need an extension rod to connect to the brake pedal arm, also purchased from eBay from Rod Parts Dealer PNs GH101 + GH5564. This makes the position of the pedal adjustable. I have not yet purchased the master cylinder yet, still deciding which one, but it will be a 1.125 inch unit.