Sam, the reason L-brackets were used in my design is because our headlight housing has pretty large flat bottom part and more importantly Hella Bi-Xenon projectors have flat bottom part, and that makes it perfect. Any other projector, I would not advise mounting it that way.
The best way to do it is to build a straight wall at the back of your housing of course to size and not to eliminate stock mounting points. Through that wall, you would have to cut a hole to insert your projector through and to mount it. You could mount it also with adjstable screws so you could fine tune your positioning. So make a hole for your projector in the "wall" and then mount the wall to your housing. For the "wall" you could use lexan or acrylic. They come in different colours (even mirror finish
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) or you could just paint it. You could play as to the distance between the curved lens of a projector and your front cover. It does make a difference as well as side posioning due to a curved nature of the front cover. By the way, what you are using for your front cover?
So, back to the "wall". The reason I suggest you do this way, is because you must properly position your projector in relation to a perfectly flat ground. Otherwise your cut-off will be angled. You have to get that right to begin with.
Hi-beams. Just use Hella 90mm high beam unit. They are pretty small, but then again, I do not really know sizing of Integra projector. I think you have to be careful on this one.
Please do not stick an H7 into H3 housing. Bad beam result, even if you match the focal point. H3 is a transverse filament, but H7 is longitudinal. You could always use your decent quality driving lights.
If I may ask, why an integra projectors? There are so many better ones. Sorry, do not want to discourage you. But if you gonna hack up your lights, get something higher quality in there.