In the SCCA Solo world the tech is pretty lack (compared to club racing). Whether you get questioned depends more on the individual doing the tech then the actual rules. That being said, most harness bar installations I've seen in S30s and S130s are unsafe. The bar needs to handle the load of one or two 175lb. person(s) experiencing a 20G deceleration. You do the math.
Also, the shoulder harnesses should be as short as possible, mounting so they are straight back off the driver's shoulders (looking from above), go through specifically designed holes in the race seat, and at no more then a 20 degree up or down angle from level with the driver's shoulders (looking from the side).