If you decide to follow Wurger's flat pattern lay-out method be sure to reduce the lower wing chord by about 10%. The lower wing in Wurger's drawing is a shade under 10% shorter in chord at the root. This will give the material needed in the upper wing half to bend in the airfoil section when you match upper and lower trailing edges. I would suggest coining the wing tips to give them their rounded shapes while in the flat lay-out stage. A small round tipped hobby hammer (ballpeen) would do nicely.