I'm glad you posted this, because i have been looking for solutions--good thinkin! Below you can see my amidship rails came out all warped, and one broke (which i tried to mend, but that wound up looking like garbage, as if the warp wasnt bad enough). The molds around the base of the stanchions were really bad and chewed up, so getting them to fit together properly was tough, the rails on one side are super close together, and the other side far apart. I have a back up kit for extra parts, so I was going to redo them, but alas, two of the rails broke from that kit (one just came that way out of the box). So yeah! I will be trying this method for sure, thanks for sharing!
I just scrolled up and saw you mentioned your own difficulties with these flimsy things--let me know what you come up with.