1. Start from one side. Wick slot sideI just tried that vertical build and I had a problem with the rayon just loosing all structure and I just ended up with a ball of lint. How do you keep control of such small fibres.
It kinda worked but it was ugly.
2. If some shreds drop off, don't worry, work with what you have already inserted - and later add those shreds
3. The moment first layer has been pushed / poked in - prime the wicks (slightly)
4. Then continue with the rest of the rayon / cotton