A battery weighs 1200gm a motor 600 Esc 100+ so that's at least 1900gm. My DA50 and ignition weigh 1560gm and know I can make a reasonably light custom header and can. For the airframe I can push the boundaries harder than commercial models so I am reasonably confident of making weight and have also designed in the lighter YS option. I want the weight to be as close to 5kg as possible and will size the wing/loading to suit. With the weight concentrated in the front I can move the wing forward for the longest possible tail moment.