Hi elkhart, well come to the forum! If you have already glued the formers to the center keel and you want to cut them out in the center, to make them lighter. A rotary tool with a sanding drum will do a good job of it, "I hope so anyway
". A rotary tool can also be used with drill bits to make preforation holes in the formers to lighten them, as will as the wing ribs. Of course it makes more sense to do this before you start building, I'm not a newbe
but I have a lot to learn. If you are building a Guillow's kit as a free flight model, be sure and check out the forum for glassblade's build of his 400 series Messerschmitt Bf. 109. He is building his Bf. 109 as a rubber powered free flight model. glassblade is building his model very light and I have learned much from his building techniques, has a lot of photographs posted too. And it is a good read for anyone wanting to build a Guillow's model kit as a competition rubber powered free flight airplane. Building my Guillow's models as rubber powered free flight airplanes is what I am focusing my efforts on now, and glassblade's build is helping me a lot toward that end. To be totally honest glassblade's building skills makes me a little