How big of an area? Small spaces the Dremel may work? Bigger areas will go faster with a grinder. If you get a chance it will be well worth your time to watch both Teal (Onboard Lifestyle) and or Mads(Sail life) Refitting Athena. Do a search on the channel and you will find them talking a lot about this subject. I have seen them mostly use grinders but also a couple of times a Dremel like tool for smaller areas'. Also for a lot better advice than I can give 1. Classic Mako 2. The Hull Truth (How to section). You will find people there that have done what you are doing many times over. Good luck, I am excited to see your progress. JC