Pffft - it's your dime.
Just know that to anyone with half an ounce of knowledge about motorsport safety (even a bellend) will know what you've done is sh*t.
The harness bar is a dumb-f*ck idea by the way.
The angle of the entry of the harnesses makes a big difference because the harnesses will tear down through the seat-back in a crash - compressing your spine, as previously advertised.
Not only are the shoulder mountings going to hurt you a LOT in a crash, but because the belts are noncey little 2" harnesses designed for idiot boy racers, not motorsport, they'll probably do your collarbones, too. Oh and they'll stretch because you have them all the way down to the rear belt mounts - a nice long stretchy length.
Which means you might as well be wearing a lap belt.
Proper harnesses are 3" width and come with FIA labels with dates on them.
What you need as a minimum for the shoulder straps (when you have some proper won't-kill-you harnesses) is 120cm sq of 3mm strengthening plate welded around both of the rear turrets and 38mm diameter, 2.6mm wall-thickness Cold Drawn Steel (CDS) tube welded between them.
Just like I was doing on Dave's G2 a couple of hours ago.
You've put enough effort in elsewhere, why are you compromising on your safety?