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I'm new to this sport/ hobby and am still working on my first kit, a G.P. Spirit. I have all the wing panels built, and am ready to join them. My problem is how do I accurately sand all the ends of the panels so that I end up with everything at the proper lenght and angle? I have an idea that I think will work, and would deeply appreciate any feed back.

Here,s the idea.
I have installed nutzerts (kind of a cross between a washer and a nut that can be installed in a wooden surface, that essentially is a threaded nut into a board) on the hollow core door I use as a building table. On the long edge I have a metal panel that I can bolt to the door to provide a fense to hold the wing panel square. On the bottom/short edge of the door I have the nutzerts installed so that the metal panel, which has slots cut to allow the panel to slide back and forth, will have adhesive backed sand paper applied to it. The idea is to hold the wing panel square using the "fense", and sand all the parts at the same time to the proper angle using the polyhedral tool supplied in the kit.
Hope this makes sense.

Please let me know what you think. I,m a stickler for accuracy and want this to turn out right.

Thanks
Rich