For the LS drive kit, I am in love with the Wegner set up and we are having a little Bull Run special on them. I can do the natural set up for $2000, Black is a few pennies more.
Obviously the $5300 for the transmission must have been a ready to go complete kit and not a basic kit they advertised. Those set ups can run five grand pretty easy with clutch, hydraulics, etc.
Tobin should be able to handle your Corvette brake package. I think it will be easy to get a hard number from him.
In your list of things you have got already, things I can think of right off you may want and have not mentioned. Popular items. Some of the bigger chunk $$$$$. Some round numbers for complete kits.
Radiator $900
Smoked Glass $750
Power Windows $750
Vintage Air $1100
Tilt Steering $400
Headers $800
Magnaflow Exhaust $500
Fuel System Budget $2000 for stainless tank / pump / filters / hose
Gauges $500 to $800?
Someday I will finish my check list
Call me later if you have questions