Do any of you make your own plywood fins without the use of power tools? If so, how do you go about it? If that is not feasible, can it be done easily with "hand" power tools? I'm thinking cut out with a jigsaw and then use a sanding block for final shaping. It seems like a jigsaw might be hard to handle on 1/8" plywood. Would a scrollsaw be a better choice? Is there a "best" practice? I'm not ready to invest in a full set of power tools yet but would like to be able to design and build some custom MPR/HPR rockets.