John Shriver , May 05, 2008; 10:34 p.m.
I suspect that you will find that the opaque apron in the Kodak Film Tank is quite likely to shatter into shreds when you try and unwind it. If not, it should be opaque enough, but I would certainly do it in low light. You will need to use a developer with low activity, to have any hope of even modestly uniform development. Realize that this tank was from when films were developed to much higher contrast indexes than today.
Also, the modern paper is way too water tight, being plasticised on the inside, so you can't follow the original technique. (Presuming you have Verichrome Pan.)
The ideal solution is to get a Nikor 24 ounce tank, and the Nikor 122 reel. But the latter is scarce as hen's teeth. I suppose one could cut a 20 exposure 35mm reel in half, and lengthen the four rods with stainless steel tubing and epoxy. (But don't try that with a 120 reel, not enough turns of the spiral.) It might be easier to make a plastic spool wider, if you can get PVC pipe of the right diameter.
The classic darkroom way is to hold each end of the film in a film clip, hold the film in a U, and "see saw" through a large bowl of developer.
You can re-spool with 105mm microfilm, but it will need to be slit down to a narrower width. Film for Classics probably can sell you lengths of the film already slit, since they have a hard time sourcing spools and paper. But it's awfully slow film, and hard to develop to low contrast.