I went ahead and built my self one. went with 3/8 rods over the 5/8ths rods due to pricing, less than half the cost for each. 5 bucks verses $12 for the 5/8ths rods.
Had a Oak Captains Bed frame took out of my kids room super solid 1/2 inch wood so decided to recycle, simply cut the long planks in 1/2 and stained with black cherry Varathane now a beautiful 37 inch by 20 inch 4 shelf Flexi.
Surprisingly stable for only 3/8ths rods and the black cherry goes quite well with my Boston cherry Axioms
Thanx Nick, it was a fun 2 day project.
