To answer your questions:
#1- I have seen those bowls from the column on ebay- others might be able to confirm if they are available aftermarket, as replacements.
#2- There are many posts on bench to bucket seat conversions, but basically, you need a kit marketed by the aftermarket suppliers that provides you with 2 brackets for each seat. One is very small, and just provides a mounting point for the outboard seat track in the front- (so just the outboard rear bolt hole is used ) The inboard perch uses a bracket that gets welded to the floorpan and allows bolting the inner seat track to it. Measurements are rather critical for proper alignment- get it right the first time. Point of importance: There are two different types of bracket kits, a cheap one, and the better one. Spend the bucks for the better one.
#3- Shifter hole? There is nothing needed for the shifter cable hole- a rubber boot (seal) prevents fumes and water from migrating in around the cable, and a plate that has 3 holes for sheetmetal screws to hold the boot in place.
#4-Console bracket- there is a bracket that gets welded to the floor- actually the tranny tunnel, back towards the rear of the console, that has a flat top surface. There are two holes inside the console glovebox that accept sheetmetal screws to secure the back. Specific measurements dictate where this bracket is welded, and again if ou search for this, the dimensions are out there. The front of the console is secured to the shifter assembly- there are dimples in the tranny tunnel sheetmetal that assist in locating the position of the shifter assembly.
Good luck!