Welded solid. For nozzles, I plan on JYing a pair from an Intrepid, as they have three directions they spray. The plan is to drill a bunch of holes when (and if) I can get it straightened out so that it fits the windshield again. The middle didn't like much heat and pulled up about 3/4 of an inch. I cut each section and welded it back in before moving on to the next piece.
I debated awhile on the design, and finally settled on a basic oval shape. Length-wise, it will be shorter than the factory openings by about six inches on each side. After looking at a couple vehicles, I think the holes will end up being about 1/4 diameter.
I actually did this a couple months ago, but the Blazer went on the back burner due to lifes twists. Did manage to get my tubing bender built, but now I want to modify that and then paint it.
P.S. the motivation comes from not wanting to fabricate those air boxes again. For some stupid azz reason, I picked the most god awful area to tinker with and learn to weld on- the cowl section. The motivation on this piece was not to let bigger materials collect around the boxes again. Most cowls are stamped for aesthetic reasons. I feel the airflow is not too important due to it not being sealed. Though the base of the windshield is pry the best low pressure spot you can get.
That being said, I feel I bit off more than I can tackle. I picture the final outcome (aesthetics) as not quite as I had planned. I suspect that there is a very slight curve that I hadn't accounted for that will affect the fitment. In my head, I know what I want, but in reality, I don't have the knowledge to make it work yet. For me, I have to tackle the problem at hand before I can move on. I feel I hit a failure here.