Here's what I *did* want (or, at least, something similar to it):
So here's *my* take on it! I placed mine higher up because the oil system is gravity fed--I wanted to ensure the tank was high enough that oil flow would not be a problem.
I started with 1.5" wide, 3/16" mild steel flat stock. I cut a piece that will be welded to the frame, and then two arms to connect it to the oil tank. I drilled .75" holes into the end of each arm for the rubber isolators and then shaped the ends to clean them up. After that I mocked it up and tacked them into place.
After ensuring they were pretty straight, I then welded them together. I'm a beginner welder, using a 90A flux core welder, but for my purposes, it'll work. After these welds were made, I then flipped the piece over and laid a bead on the back side. The front face was smoothed over with a flap wheel so that it would sit flush when mounted to the frame.
It looked good to me, so I laid a few beads on to secure it in place.
So now I need to weld another mounting bung onto the rear of the tank, near the bottom, for a third arm that I'll weld onto the bracket. This will ensure good support and keep the tank safely in place. As it sits, it can swing fore-and-aft a decent amount because of the play the rubber mounts give it. A third brace will keep it from swinging. I also need to weld gussets under the bracket's arms. Wish I had done that before welding it to the frame!