Roll Cage
The workmanship and welding looks good, apparently MIG welded. However, I'm in agreement with the other posts about the dash bar. Also, it seems that the positioning of the front "Down Bars" were the cause of the problem with the dash bar. The Down bars need to follow as closely as possible with the "A" pillar through a hole in the top of the dash. This would have allowed you to tuck the dash bar up under the dash instead of at your kneecaps. It's also a good idea also to brace the down bars to the "A" pillar as this would help stiffen up the front of the body. Additionally, the door cross bar might be too low if it doesn't pass halfway between the driver's shoulder and elbow. The straight tubing spine brace might make it difficult to get a seat into the car in a position that makes this car comfortable for you to drive. I believe that the requirement might be .125" wall mild steel tubing in 1.75" OD.
FWIW
Lou