While not exactly home made I did cut down my Kargo Master "Safari" rack to fit better. It was too wide and just didn't look right even after I flipped the top cage around. They are made for a Jeep and are 52" W x 60" L, which doesn't fit the 3rd Gen 4Runner at all.
I also remounted it using the mounts that came with it, by reusing the factory rail "nuts". Way better than mounting it to the factory cross bars which didn't look good at all.
I cut the base down 6" on each side and cut 10" out of the center. I bolted the top cage back together and now it fits just right.
I call BS. No way you cut that, that straight with a sawzall!! I like the way it came out. So the angle mounts came with the rack?
Ones that are bolted to the roof rails.