I may be the last person to the party on this, but if not, here is a kit that makes paper patching a lot easier. If you are thinking of doing paper patching you should get Paul Matthews book called "The Paper Jacket" to learn the tricks of the trade, watch the video from this site and order the kit. The kit has two adjustable paper strip cutting guides, four if you order both sizes, two adjustable paper templates, spare shims for the templates, two bullet size end caps for the templates, a paper stacker to keep the strips in order, an adjustable bullet rolling board, Xacto knife, spare parts, and a source for paper stock. The kit is fully adjustable which is what makes it great. It is probably best to send Doug an email about what you want to do, he is a wealth of information. You will need a cutting matt and those are available from Amazon or many other on line sources or hobby craft stores. Also a caliper to set the paper strip cutting guides is very helpful, but you should already have one of those.
https://www.bpcr3d.com/
https://www.bpcr3d.com/