I "heart" my Thomas Duplex too! I run mine throttled way down in my mid-sized darkroom with low ceilings. I could probably open the vanes more, but it is plenty bright for me now and has been safe with every paper I've tested. At least one of mine came from a color lab and a friend uses his for color, but I haven't tried that yet. Mine is currently way to close to the paper supply on my color printer.
That is a nice renovation guide. I can't remember what I did for my color set, but I made my black and white only set with Kodalith. Cheap on eBay, but no cheaper than your solution. I found vinyl tape the exact width in a set with several appropriate colors at Lowes. Certainly not necessary, but these seem like an exact match to the original tape on mine.