Swapping front seats and harness

[EmeraldRegice]

So I am starting with a 1995 vr4, factory everything. The end result will be racing seats, with a 5 point harness attached. I am undecided on taking out the OEM front seat belts, or just adding the 5 point harness in addition to them. First off, after about a month of some research, I would like some help and advise from others. I doubt many of you are going after what I am, but if you know where to find the info or know what I am intending to do, please help me figure this out.

The end result I want is a way to have a 5 point racing harness installed, perferably without having to install any bars across the vehicle to have to mount the harness. Is this even possible since I want to keep the back seats usable by any means possible. I've seen the info about this, it is extremely hard to make it work, but it can be done aparently. One way is using the rear seat mounts. Is this something that is feasible?

If I am required(which i really hope not) to insert a bar of some/any kind, where should I be looking and how best should such a project be completed for this platform of vehicle? Currently I am going to look and as time progresses, I will be adding in a roll bar/cage for the track. This is only for look/style right now since I don't need functionality until another year or two and the car is more "tweaked", as it is already tuned, to be for the track.

There is always the low road with the "universal" harness bars, I just want to hear what other people have going through their minds in regards to what I have planned out. Plus, the more people you get feedback from, the better quality idea can be formed to create the best desired result.

Now I ask, for someone wanting to install a full roll cage while doing this project, what advise can be given there?

Edit: How would I BEST go about building a harness bar for this application? We don't need horrible spinal fracturing, is best to learn from those who have encountered those. I've looked into making your own, but right now, what design would you use for such an application? This I hope can become a good reference to anyone looking to perform such a project on their vehicle, and by doing so the safest way possible.