@Phyregod, in terms of the seat and seat belts, you'll want to be careful combining stock 3-point belts with an aftermarket race "bucket" seat. A race seat like the Kirkey has lap belt holes that the lap belt, whether 3-point or 5/6-point must be routed through. You cannot put the lap belt across the top of such a seat, so you've got what I would say are three options:
1) Use the stock 3-point belt, but route it from the top of the B pillar through the inside of the seat and back out to the bottom of the B pillar. Then you need to somehow figure out how to latch it to the receptacle, which I would highly highly recommend you have outside of the seat. If the receptacle is inside the seat, that's a major pressure point in a crash and it's probably uncomfortable and cumbersome anyway.
2) Run 3 point and 5/6-point belts concurrently. I do this. It's really no issue when I'm driving on the street and the camlock is between my legs.
3) Get a seat like the Tillett B5 (https://www.torqued.io/tillett-b5-r...-car-seat)
that has a good amount of bolstering and is used by many track day / auto-x drivers, yet is compatible with 3-point stock belts because it doesn't have lap belt holes. Bonus is that you can still run this seat with a 5/6-point belt should you ever choose to upgrade.
Hope that helps in making a seat choice...