Originally I just used a dollar store TV antenna which had the aerials attached to a little plastic 'T' piece that fit into a socket on many small TVs, no base to it. I clipped the wires off and gaff taped it to the painter pole and it worked fine.
If you discard the base so that you just have the two individual antennas, you'll need some way to hold the them together and attach them to the stand. Moke posted a link earlier in the thread to his telescopic antenna spreader bar where the threaded aerials screw into a nut coupler to connect them (if I recall correctly). When I built the second rig with the stand, I fabricated a little aluminum bracket, sort of like a mini mic bar. It has three holes, one for the stand stud and two smaller ones for the antenna studs. The ends of the bar are bent up at a 45 deg angle and the antennas attach to the bottom side, so all the studs exit the top of the bar. I did that to provide enough range of motion to the antenna hinge joints so that they would fold down parallel to the stand when stowed and pivot up to around 55 degrees above horizontal, which gives me plenty of height. I can get the mics an easy 2' above the top of the stand that way and don't need to use the extension bars at all. I've never needed to use them on this rig.
The extension bars can be useful for other things though. Simply, they are made of all-thread rod with the same thread as the stand stud, so they can screw into each other or directly onto the stand. If you want to use them on the 001B stand, keep in mind that it was not designed for a tall heavy load and risks toppling. The steel rod is much heavier than the aluminum stand sections and creates a lot of weight aloft.
The Nerf balls are great as stand feet. But I suggest using the stand with your choice of small microphones as a straight spaced omni rig by just gaff taping or clipping your mics to the ends of the antennas. If arranged so the antennas go close enough you could do directional mic arrays too of course. But I don't recommend duplicating the specialized spherical APE mic baffles unless you really get your head around how and why they work and what they are supposed to do. You then would need to determine if they will actually work for your choice of mic theoretically, make sure you can build them so that they perform correctly, and figure out when and where and how best to use them. They can easily make your recordings worse not better. The rest of the rig is easy and straightforward, the sphere baffles are the experimental part which I can't yet endorse fully without the above disclaimer!
A Jecklin disk is much more straight forward and would be my 1st choice in the center of a drum circle. You can build one that attaches to the stand's stud along with the antenna. Set up the antennas so the mics land in the center face of the disk with the aerials straight up and you can adjust spacing and angles as you wish from there. I can do that by flipping over my antenna bracket before attaching the disc to the stud.
Thanks for the kind words,
Keep on DIY'ing..